1#!/bin/sh
2
3# Copyright (c) 2020 Fabian Henneke.
4# Use of this source code is governed by a BSD-style
5# license that can be found in the LICENSE file.
6# SPDX-License-Identifier: BSD-2-Clause
7
8
9if [ $(uname) != "Linux" ] ; then
10   echo "Can only run on Linux"
11   exit 1
12fi
13
14TOKEN_VERSION=$(${FIDO_TOOLS_PREFIX}fido2-token -V 2>&1)
15if [ $? -ne 0 ] ; then
16    echo "Please install libfido2 1.5.0 or higher"
17    exit
18fi
19
20TOKEN_VERSION_MAJOR=$(echo "$TOKEN_VERSION" | cut -d. -f1)
21TOKEN_VERSION_MINOR=$(echo "$TOKEN_VERSION" | cut -d. -f2)
22if [ $TOKEN_VERSION_MAJOR -eq 0 -o $TOKEN_VERSION_MAJOR -eq 1 -a $TOKEN_VERSION_MINOR -lt 5 ] ; then
23    echo "Please install libfido2 1.5.0 or higher (current version: $TOKEN_VERSION)"
24    exit 1
25fi
26
27set -e
28
29TOKEN_OUTPUT=$(${FIDO_TOOLS_PREFIX}fido2-token -L)
30DEV_PATH_NAMES=$(echo "$TOKEN_OUTPUT" | sed -r 's/^(.*): .*\((.*)\)$/\1 \2/g')
31DEV_COUNT=$(echo "$DEV_PATH_NAMES" | wc -l)
32
33for i in $(seq 1 $DEV_COUNT)
34do
35    DEV_PATH_NAME=$(echo "$DEV_PATH_NAMES" | sed "${i}q;d")
36    DEV_PATH=$(echo "$DEV_PATH_NAME" | cut -d' ' -f1)
37    DEV_NAME=$(echo "$DEV_PATH_NAME" | cut -d' ' -f1 --complement)
38    DEV_PRETTY=$(echo "$DEV_NAME (at '$DEV_PATH')")
39    if expr match "$(${FIDO_TOOLS_PREFIX}fido2-token -I $DEV_PATH)" ".* credMgmt.* clientPin.*\|.* clientPin.* credMgmt.*" > /dev/null ; then
40        printf "Enter PIN for $DEV_PRETTY once (ignore further prompts): "
41        stty -echo
42        read PIN
43        stty echo
44        printf "\n"
45        RESIDENT_RPS=$(echo "${PIN}\n" | setsid -w ${FIDO_TOOLS_PREFIX}fido2-token -L -r $DEV_PATH | cut -d' ' -f3)
46        printf "\n"
47        RESIDENT_RPS_COUNT=$(echo "$RESIDENT_RPS" | wc -l)
48        FOUND=0
49        for j in $(seq 1 $DEV_RESIDENT_RPS_COUNT)
50        do
51            RESIDENT_RP=$(echo "$RESIDENT_RPS" | sed "${j}q;d")
52            UNPROT_CREDS=$(echo "${PIN}\n" | setsid -w ${FIDO_TOOLS_PREFIX}fido2-token -L -k $RESIDENT_RP $DEV_PATH | grep ' uvopt$' | cut -d' ' -f2,3,4)
53            printf "\n"
54            UNPROT_CREDS_COUNT=$(echo "$UNPROT_CREDS" | wc -l)
55            if [ $UNPROT_CREDS_COUNT -gt 0 ] ; then
56                FOUND=1
57                echo "Unprotected credentials on $DEV_PRETTY for '$RESIDENT_RP':"
58                echo "$UNPROT_CREDS"
59            fi
60        done
61        if [ $FOUND -eq 0 ] ; then
62            echo "No unprotected credentials on $DEV_PRETTY"
63        fi
64    else
65        echo "$DEV_PRETTY cannot enumerate credentials"
66        echo "Discovering unprotected SSH credentials only..."
67        STUB_HASH=$(echo -n "" | openssl sha256 -binary | base64)
68        printf "$STUB_HASH\nssh:\n" | ${FIDO_TOOLS_PREFIX}fido2-assert -G -r -t up=false $DEV_PATH 2> /dev/null || ASSERT_EXIT_CODE=$?
69        if [ $ASSERT_EXIT_CODE -eq 0 ] ; then
70            echo "Found an unprotected SSH credential on $DEV_PRETTY!"
71        else
72            echo "No unprotected SSH credentials (default settings) on $DEV_PRETTY"
73        fi
74    fi
75    printf "\n"
76done
77