717 lines
17 KiB
Plaintext
717 lines
17 KiB
Plaintext
## <summary>Policy common to all email tranfer agents.</summary>
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########################################
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## <summary>
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## MTA stub interface. No access allowed.
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## </summary>
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## <param name="domain" optional="true">
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## N/A
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## </param>
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#
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interface(`mta_stub',`
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gen_require(`
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type sendmail_exec_t;
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')
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')
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#######################################
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## <summary>
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## Basic mail transfer agent domain template.
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## </summary>
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## <desc>
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## <p>
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## This template creates a derived domain which is
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## a email transfer agent, which sends mail on
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## behalf of the user.
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## </p>
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## <p>
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## This is the basic types and rules, common
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## to the system agent and user agents.
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## </p>
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## </desc>
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## <param name="domain_prefix">
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## The prefix of the domain (e.g., user
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## is the prefix for user_t).
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## </param>
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#
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template(`mta_base_mail_template',`
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gen_require(`
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attribute user_mail_domain;
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type sendmail_exec_t;
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')
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##############################
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#
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# $1_mail_t declarations
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#
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type $1_mail_t, user_mail_domain;
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domain_type($1_mail_t)
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domain_entry_file($1_mail_t,sendmail_exec_t)
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type $1_mail_tmp_t;
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files_tmp_file($1_mail_tmp_t)
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##############################
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#
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# $1_mail_t local policy
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#
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allow $1_mail_t self:capability { setuid setgid chown };
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allow $1_mail_t self:process { signal_perms setrlimit };
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allow $1_mail_t self:tcp_socket create_socket_perms;
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# re-exec itself
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can_exec($1_mail_t, sendmail_exec_t)
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allow $1_mail_t sendmail_exec_t:lnk_file r_file_perms;
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kernel_read_kernel_sysctl($1_mail_t)
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corenet_tcp_sendrecv_all_if($1_mail_t)
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corenet_raw_sendrecv_all_if($1_mail_t)
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corenet_tcp_sendrecv_all_nodes($1_mail_t)
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corenet_raw_sendrecv_all_nodes($1_mail_t)
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corenet_tcp_sendrecv_all_ports($1_mail_t)
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corenet_tcp_bind_all_nodes($1_mail_t)
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corenet_tcp_connect_all_ports($1_mail_t)
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corenet_tcp_connect_smtp_port($1_mail_t)
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corecmd_exec_bin($1_mail_t)
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corecmd_search_sbin($1_mail_t)
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files_read_etc_files($1_mail_t)
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files_search_spool($1_mail_t)
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# It wants to check for nscd
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files_dontaudit_search_pids($1_mail_t)
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libs_use_ld_so($1_mail_t)
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libs_use_shared_libs($1_mail_t)
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logging_send_syslog_msg($1_mail_t)
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miscfiles_read_localization($1_mail_t)
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sysnet_read_config($1_mail_t)
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sysnet_dns_name_resolve($1_mail_t)
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optional_policy(`nis',`
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nis_use_ypbind($1_mail_t)
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')
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optional_policy(`nscd',`
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nscd_use_socket($1_mail_t)
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')
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optional_policy(`procmail',`
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procmail_exec($1_mail_t)
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')
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optional_policy(`sendmail',`
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gen_require(`
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type etc_mail_t, mail_spool_t, mqueue_spool_t;
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')
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allow $1_mail_t $1_mail_tmp_t:dir create_dir_perms;
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allow $1_mail_t $1_mail_tmp_t:file create_file_perms;
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files_create_tmp_files($1_mail_t, $1_mail_tmp_t, { file dir })
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allow $1_mail_t etc_mail_t:dir { getattr search };
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# Write to /var/spool/mail and /var/spool/mqueue.
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allow $1_mail_t mail_spool_t:dir rw_dir_perms;
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allow $1_mail_t mail_spool_t:file create_file_perms;
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allow $1_mail_t mqueue_spool_t:dir rw_dir_perms;
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allow $1_mail_t mqueue_spool_t:file create_file_perms;
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# Check available space.
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fs_getattr_xattr_fs($1_mail_t)
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files_read_etc_runtime_files($1_mail_t)
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# Write to /var/log/sendmail.st
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sendmail_manage_log($1_mail_t)
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sendmail_create_log($1_mail_t)
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')
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ifdef(`TODO',`
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ifdef(`qmail.te', `
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allow $1_mail_t qmail_etc_t:dir search;
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allow $1_mail_t qmail_etc_t:{ file lnk_file } read;
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')
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') dnl end TODO
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')
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#######################################
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## <summary>
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## The per user domain template for the mta module.
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## </summary>
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## <desc>
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## <p>
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## This template creates a derived domain which is
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## a email transfer agent, which sends mail on
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## behalf of the user.
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## </p>
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## <p>
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## This template is invoked automatically for each user, and
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## generally does not need to be invoked directly
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## by policy writers.
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## </p>
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## </desc>
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## <param name="userdomain_prefix">
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## The prefix of the user domain (e.g., user
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## is the prefix for user_t).
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## </param>
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## <param name="user_domain">
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## The type of the user domain.
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## </param>
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## <param name="user_role">
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## The role associated with the user domain.
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## </param>
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#
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template(`mta_per_userdomain_template',`
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gen_require(`
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attribute mailserver_domain, mta_user_agent;
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attribute mailserver_delivery, user_mail_domain;
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type sendmail_exec_t;
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')
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mta_base_mail_template($1)
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role $3 types $1_mail_t;
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##############################
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#
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# $1_mail_t local policy
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#
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# Transition from the user domain to the derived domain.
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domain_auto_trans($2, sendmail_exec_t, $1_mail_t)
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allow $2 sendmail_exec_t:lnk_file { getattr read };
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allow $2 $1_mail_t:fd use;
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allow $1_mail_t $2:fd use;
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allow $1_mail_t $2:fifo_file rw_file_perms;
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allow $1_mail_t $2:process sigchld;
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# For when the user wants to send mail via port 25 localhost
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kernel_tcp_recvfrom($2)
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allow $2 mailserver_domain:tcp_socket { connectto recvfrom };
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allow mailserver_domain $2:tcp_socket { acceptfrom recvfrom };
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domain_use_wide_inherit_fd($1_mail_t)
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userdom_use_user_terminals($1,$1_mail_t)
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# Write to the user domain tty. cjp: why?
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userdom_use_user_terminals($1,mta_user_agent)
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# Create dead.letter in user home directories.
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userdom_manage_user_home_subdir_files($1,$1_mail_t)
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userdom_create_user_home($1,$1_mail_t,file)
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# for reading .forward - maybe we need a new type for it?
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# also for delivering mail to maildir
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userdom_manage_user_home_subdirs($1,mailserver_delivery)
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userdom_manage_user_home_subdir_files($1,mailserver_delivery)
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userdom_manage_user_home_subdir_symlinks($1,mailserver_delivery)
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userdom_manage_user_home_subdir_pipes($1,mailserver_delivery)
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userdom_manage_user_home_subdir_sockets($1,mailserver_delivery)
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userdom_create_user_home($1,mailserver_delivery,{ dir file lnk_file fifo_file sock_file })
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tunable_policy(`use_samba_home_dirs',`
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fs_manage_cifs_files($1_mail_t)
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fs_manage_cifs_symlinks($1_mail_t)
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')
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optional_policy(`postfix',`
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allow $1_mail_t self:capability dac_override;
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postfix_read_config($1_mail_t)
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postfix_list_spool($1_mail_t)
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')
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ifdef(`TODO',`
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# Read user temporary files.
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allow $1_mail_t $1_tmp_t:file r_file_perms;
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dontaudit $1_mail_t $1_tmp_t:file append;
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ifdef(`postfix.te',`
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# postfix seems to need write access if the file handle is opened read/write
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allow $1_mail_t $1_tmp_t:file write;
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')
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allow mta_user_agent $1_tmp_t:file r_file_perms;
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# if you do not want to allow dead.letter then use the following instead
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#allow $1_mail_t { $1_home_dir_t $1_home_t }:dir r_dir_perms;
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#allow $1_mail_t $1_home_t:file r_file_perms;
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') dnl end TODO
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')
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########################################
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## <summary>
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## Provide extra permissions for admin users
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## mail domain.
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## </summary>
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## <param name="userdomain_prefix">
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## The prefix of the user domain (e.g., user
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## is the prefix for user_t).
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## </param>
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## <param name="user_domain">
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## The type of the user domain.
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## </param>
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#
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template(`mta_admin_template',`
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ifdef(`strict_policy',`
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# allow the sysadmin to do "mail someone < /home/user/whatever"
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userdom_read_unpriv_user_home_files($1_mail_t)
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')
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optional_policy(`postfix',`
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gen_require(`
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attribute mta_user_agent;
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type etc_aliases_t;
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')
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allow mta_user_agent $2:fifo_file { read write };
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allow $1_mail_t etc_aliases_t:dir create_dir_perms;
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allow $1_mail_t etc_aliases_t:file create_file_perms;
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allow $1_mail_t etc_aliases_t:lnk_file create_lnk_perms;
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allow $1_mail_t etc_aliases_t:sock_file create_file_perms;
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allow $1_mail_t etc_aliases_t:fifo_file create_file_perms;
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files_create_etc_config($1_mail_t,etc_aliases_t,{ file lnk_file sock_file fifo_file })
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# postfix needs this for newaliases
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files_getattr_tmp_dir($1_mail_t)
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postfix_exec_master($1_mail_t)
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ifdef(`distro_redhat',`
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# compatability for old default main.cf
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postfix_create_config($1_mail_t,etc_aliases_t,{ dir file lnk_file sock_file fifo_file })
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')
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')
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')
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#######################################
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#
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# mta_mailserver(domain,entrypointtype)
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#
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interface(`mta_mailserver',`
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gen_require(`
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attribute mailserver_domain;
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')
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# For when the user wants to send mail via port 25 localhost
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kernel_tcp_recvfrom($1)
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init_daemon_domain($1,$2)
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typeattribute $1 mailserver_domain;
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')
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########################################
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## <summary>
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## Modified mailserver interface for
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## sendmail daemon use.
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## </summary>
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## <desc>
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## <p>
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## A modified MTA mail server interface for
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## the sendmail program. It's design does
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## not fit well with policy, and using the
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## regular interface causes a type_transition
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## conflict if direct running of init scripts
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## is enabled.
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## </p>
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## <p>
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## This interface should most likely only be used
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## by the sendmail policy.
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## </p>
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## </desc>
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## <param name="domain">
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## The type to be used for the mail server.
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## </param>
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## <param name="entry_point">
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## The type to be used for the domain entry point program.
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## </param>
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interface(`mta_sendmail_mailserver',`
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gen_require(`
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attribute mailserver_domain;
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type sendmail_exec_t;
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')
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# For when the user wants to send mail via port 25 localhost
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kernel_tcp_recvfrom($1)
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init_system_domain($1,sendmail_exec_t)
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typeattribute $1 mailserver_domain;
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')
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#######################################
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## <summary>
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## Make a type a mailserver type used
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## for sending mail.
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## </summary>
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## <param name="domain">
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## Mail server domain type used for sending mail.
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## </param>
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#
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interface(`mta_mailserver_sender',`
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gen_require(`
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attribute mailserver_sender;
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')
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typeattribute $1 mailserver_sender;
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')
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#######################################
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## <summary>
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## Make a type a mailserver type used
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## for delivering mail to local users.
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## </summary>
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## <param name="domain">
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## Mail server domain type used for delivering mail.
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## </param>
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#
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interface(`mta_mailserver_delivery',`
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gen_require(`
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attribute mailserver_delivery;
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type mail_spool_t;
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')
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typeattribute $1 mailserver_delivery;
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allow $1 mail_spool_t:dir ra_dir_perms;
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allow $1 mail_spool_t:file { create ioctl read getattr lock append };
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allow $1 mail_spool_t:lnk_file { create read getattr };
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optional_policy(`dovecot',`
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dovecot_manage_spool($1)
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')
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optional_policy(`mailman',`
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# so MTA can access /var/lib/mailman/mail/wrapper
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files_search_var_lib($1)
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mailman_domtrans($1)
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mailman_read_data_symlinks($1)
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')
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')
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#######################################
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## <summary>
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## Make a type a mailserver type used
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## for sending mail on behalf of local
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## users to the local mail spool.
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## </summary>
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## <param name="domain">
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## Mail server domain type used for sending local mail.
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## </param>
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#
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interface(`mta_mailserver_user_agent',`
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gen_require(`
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attribute mta_user_agent;
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')
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typeattribute $1 mta_user_agent;
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optional_policy(`apache',`
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# apache should set close-on-exec
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apache_dontaudit_rw_stream_socket($1)
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apache_dontaudit_rw_sys_script_stream_socket($1)
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')
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')
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#######################################
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#
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# mta_send_mail(domain)
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#
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interface(`mta_send_mail',`
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gen_require(`
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attribute mta_user_agent;
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type system_mail_t, sendmail_exec_t;
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')
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allow $1 sendmail_exec_t:lnk_file r_file_perms;
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domain_auto_trans($1, sendmail_exec_t, system_mail_t)
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allow $1 system_mail_t:fd use;
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allow system_mail_t $1:fd use;
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allow system_mail_t $1:fifo_file rw_file_perms;
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allow system_mail_t $1:process sigchld;
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allow mta_user_agent $1:fd use;
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allow mta_user_agent $1:process sigchld;
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allow mta_user_agent $1:fifo_file { read write };
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')
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#######################################
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#
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# mta_exec(domain)
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#
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interface(`mta_exec',`
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gen_require(`
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type sendmail_exec_t;
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')
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can_exec($1, sendmail_exec_t)
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')
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########################################
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## <summary>
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## Read mail server configuration.
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## </summary>
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## <param name="domain">
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## The type of the process performing this action.
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## </param>
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#
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interface(`mta_read_config',`
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gen_require(`
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type etc_mail_t;
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')
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files_search_etc($1)
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allow $1 etc_mail_t:dir list_dir_perms;
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allow $1 etc_mail_t:file r_file_perms;
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allow $1 etc_mail_t:lnk_file { getattr read };
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')
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########################################
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## <summary>
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## Read mail address aliases.
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## </summary>
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## <param name="domain">
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## The type of the process performing this action.
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## </param>
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#
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interface(`mta_read_aliases',`
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gen_require(`
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type etc_aliases_t;
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class file r_file_perms;
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')
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files_search_etc($1)
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allow $1 etc_aliases_t:file r_file_perms;
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')
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#######################################
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#
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# mta_rw_aliases(domain)
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#
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interface(`mta_rw_aliases',`
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gen_require(`
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type etc_aliases_t;
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class file { rw_file_perms setattr };
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')
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files_search_etc($1)
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allow $1 etc_aliases_t:file { rw_file_perms setattr };
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')
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#######################################
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## <summary>
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## Do not audit attempts to read and write TCP
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## sockets of mail delivery domains.
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## </summary>
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## <param name="domain">
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## Mail server domain.
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## </param>
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#
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interface(`mta_dontaudit_rw_delivery_tcp_socket',`
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gen_require(`
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attribute mailserver_delivery;
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')
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dontaudit $1 mailserver_delivery:tcp_socket { read write };
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')
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#######################################
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## <summary>
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## Connect to all mail servers over TCP.
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## </summary>
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## <param name="domain">
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## Mail server domain.
|
|
## </param>
|
|
#
|
|
interface(`mta_tcp_connect_all_mailservers',`
|
|
gen_require(`
|
|
attribute mailserver_domain;
|
|
')
|
|
|
|
allow $1 mailserver_domain:tcp_socket { connectto recvfrom };
|
|
allow mailserver_domain $1:tcp_socket { acceptfrom recvfrom };
|
|
kernel_tcp_recvfrom($1)
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Do not audit attempts to read a symlink
|
|
## in the mail spool.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain allowed access.
|
|
## </param>
|
|
#
|
|
interface(`mta_dontaudit_read_spool_symlink',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
class lnk_file read;
|
|
')
|
|
|
|
dontaudit $1 mail_spool_t:lnk_file read;
|
|
')
|
|
|
|
#######################################
|
|
#
|
|
# mta_getattr_spool(domain)
|
|
#
|
|
interface(`mta_getattr_spool',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
class dir r_dir_perms;
|
|
class file getattr;
|
|
class lnk_file read;
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mail_spool_t:dir r_dir_perms;
|
|
allow $1 mail_spool_t:lnk_file read;
|
|
allow $1 mail_spool_t:file getattr;
|
|
')
|
|
|
|
#######################################
|
|
#
|
|
# mta_rw_spool(domain)
|
|
#
|
|
interface(`mta_rw_spool',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
class dir r_dir_perms;
|
|
class lnk_file { getattr read };
|
|
class file { rw_file_perms setattr };
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mail_spool_t:dir r_dir_perms;
|
|
allow $1 mail_spool_t:lnk_file { getattr read };
|
|
allow $1 mail_spool_t:file { rw_file_perms setattr };
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Create, read, and write the mail spool.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain allowed access.
|
|
## </param>
|
|
#
|
|
interface(`mta_append_spool',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
class dir ra_dir_perms;
|
|
class lnk_file { getattr read };
|
|
class file create_file_perms;
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mail_spool_t:dir ra_dir_perms;
|
|
allow $1 mail_spool_t:lnk_file { getattr read };
|
|
allow $1 mail_spool_t:file create_file_perms;
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Delete from the mail spool.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain allowed access.
|
|
## </param>
|
|
#
|
|
interface(`mta_delete_spool',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mail_spool_t:dir { list_dir_perms write remove_name };
|
|
allow $1 mail_spool_t:file unlink;
|
|
')
|
|
|
|
#######################################
|
|
#
|
|
# mta_manage_spool(domain)
|
|
#
|
|
interface(`mta_manage_spool',`
|
|
gen_require(`
|
|
type mail_spool_t;
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mail_spool_t:dir manage_dir_perms;
|
|
allow $1 mail_spool_t:lnk_file create_lnk_perms;
|
|
allow $1 mail_spool_t:file manage_file_perms;
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Do not audit attempts to read and
|
|
## write the mail queue.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain to not audit.
|
|
## </param>
|
|
#
|
|
interface(`mta_dontaudit_rw_queue',`
|
|
gen_require(`
|
|
type mqueue_spool_t;
|
|
')
|
|
|
|
dontaudit $1 mqueue_spool_t:file { getattr read write };
|
|
')
|
|
|
|
#######################################
|
|
#
|
|
# mta_manage_queue(domain)
|
|
#
|
|
interface(`mta_manage_queue',`
|
|
gen_require(`
|
|
type mqueue_spool_t;
|
|
class dir rw_dir_perms;
|
|
class file create_file_perms;
|
|
')
|
|
|
|
files_search_spool($1)
|
|
allow $1 mqueue_spool_t:dir rw_dir_perms;
|
|
allow $1 mqueue_spool_t:file create_file_perms;
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Read sendmail binary.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain allowed access.
|
|
## </param>
|
|
#
|
|
# cjp: added for postfix
|
|
interface(`mta_read_sendmail_bin',`
|
|
gen_require(`
|
|
type sendmail_exec_t;
|
|
')
|
|
|
|
allow $1 sendmail_exec_t:file r_file_perms;
|
|
')
|
|
|
|
#######################################
|
|
## <summary>
|
|
## Read and write unix domain stream sockets
|
|
## of user mail domains.
|
|
## </summary>
|
|
## <param name="domain">
|
|
## Domain allowed access.
|
|
## </param>
|
|
#
|
|
interface(`mta_rw_user_mail_stream_socket',`
|
|
gen_require(`
|
|
attribute user_mail_domain;
|
|
')
|
|
|
|
allow $1 user_mail_domain:unix_stream_socket rw_socket_perms;
|
|
')
|