warn on umask problems (#260)

Author: sroettger

dist/activate

@@ -25,6 +25,17 @@ export KCTF_CTF_DIR="$(realpath --no-symlinks "$(dirname "${BASH_SOURCE-$0}")/..
 export KCTF_BIN="${KCTF_CTF_DIR}/kctf/bin"
 source "${KCTF_BIN}/kctf-log"
 
+function _kctf_check_umask {
+  if [[ $((8#$(umask) & 8#755)) -ne 0 ]]; then
+    _kctf_log_err "umask is too prohibitive. Please set it to 022 when using kctf"
+    return 1
+  fi
+  if [[ "$(stat "${KCTF_BIN}/kctf-cluster" --format '%a')" -ne "755" ]]; then
+    _kctf_log_err "${KCTF_BIN}/kctf-cluster has unexpected permissions. Maybe a umask problem during checkout?"
+    return 1
+  fi
+}
+
 function _kctf_setup_environment {
   KCTF_CONFIG_DIR="$(mktemp -d --tmpdir kctf.XXXXXXXXXX)"
   if [[ $? -ne 0 ]]; then
@@ -150,6 +161,7 @@ function _kctf_error_cleanup {
   unset -f _kctf_enable_completion
   unset -f _kctf_set_active_challenge
   unset -f _kctf_setup_environment
+  unset -f _kctf_check_umask
   unset -f _kctf_activate
   unset -f _kctf_chal_string
   unset -f _kctf_log
@@ -229,6 +241,8 @@ function _kctf_chal_string {
 }
 
 function _kctf_activate {
+  _kctf_check_umask || return 1
+
   if ! _kctf_setup_environment; then
     _kctf_log_err 'error setting up the environment'
     return 1