Initial commit

LICENSE

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+Copyright (c) 2018, Thomas L <tom@dl6tom.de>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Makefile

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+.PHONY: all install
+
+PREFIX		?= /usr
+LIBEXECDIR	?= ${PREFIX}/libexec
+
+all:
+
+install:
+	install -o root -g wheel -m 750 -d "$(DESTDIR)$(LIBEXECDIR)/auth"
+	install -o root -g auth -m 555 login_-sober "$(DESTDIR)$(LIBEXECDIR)/auth/login_-sober"

login_-sober

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+#!/bin/ksh
+
+while getopts 'v:s:' opt; do
+    case "$opt" in
+        v)
+            ;;
+        s)
+            if [ 'login' != "$OPTARG" ]; then
+                exit 1
+            fi
+            ;;
+        *)
+            exit 1
+            ;;
+    esac
+done
+
+test_sentence="Please, type _exactly_ this sentence as fast as you can."
+temp_file=$(mktemp)
+echo "$test_sentence"
+{ time -p read user_sentence; } 2> "$temp_file"
+user_time=$(sed -ne 's/real *\([^.]*\).*/\1/p' < "$temp_file")
+rm -f "$temp_file"
+
+if [ "$test_sentence" == "$user_sentence" -a "$user_time" -le 15 ]; then
+    exec /usr/libexec/auth/login_passwd "$@"
+fi
+echo "Too slow or inaccurate typing."
+echo reject >&3