I am trying to allow OpenVPN to use Amazon Simple Notification Service
(SNS), so that each time a client connects to the VPN, OpenVPN
triggers a bash script that will use Amazon SNS.
Amazon SNS is a Java program launched via bash scripts.
It is in aws/SimpleNotificationServiceCli/bin/ for the .sh and /lib for the .jar
OpenVPN launches a script in /etc/openvpn/client-connect.
OpenVPN runs confined and I don't want to poke a big hole just to run SNS.
So I tried to "confine" SNS and allow the transition from OpenVPN, but
it didn't went well. (config files bellow)
I wonder if it could be just as good to allow OpenVPN to escape its
confine to only call the relevant SNS script ?
>From documentation and audit2allow I got to these configuration files.
But it still doesn't authorize the script to run and now the messages
triggers errors in audit2allow:
libsepol.mls_from_string: invalid MLS context
libsepol.mls_from_string: could not construct mls context structure
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert
system_u:object_r:proc_t: to sid
libsepol.context_from_record: type op is not defined
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert system_u:object_r:op:s0 to sid
libsepol.context_from_record: type openvpn_ is not defined
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert
system_u:object_r:openvpn_:s0 to sid
libsepol.context_from_record: type shell_e is not defined
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert
system_u:object_r:shell_e:s0 to sid
$ cat amz_sns.fc
/opt/aws/SimpleNotificationServiceCli.*/bin/.* --
gen_context(system_u:object_r:amz_sns_exec_t,s0)
/opt/aws/SimpleNotificationServiceCli.*/lib(/.*)?
gen_context(system_u:object_r:amz_sns_lib_t,s0)
$ cat amz_sns.te
policy_module( amz_sns, 1.0.0)
require {
type openvpn_t;
type openvpn_tmp_t;
type shell_exec_t;
}
type amz_sns_t;
type amz_sns_exec_t;
type amz_sns_lib_t;
files_type(amz_sns_lib_t);
domain_type(amz_sns_t)
domain_entry_file(amz_sns_t, amz_sns_exec_t)
allow amz_sns_t amz_sns_exec_t:file { read execute entrypoint };
domain_auto_trans( openvpn_t, amz_sns_exec_t, amz_sns_t );
role system_r types amz_sns_t; # ???
# The child process sends a signal to its parent as it dies
allow amz_sns_t openvpn_t:process sigchld;
allow amz_sns_t openvpn_tmp_t:file write; # For /tmp/debug
allow amz_sns_t shell_exec_t:file { read open execute execute_no_trans
}; # Bash exec
Bruno
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