mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-09-24 18:59:01 +00:00
KDF: modularize code to support kdf everywhere
This commit is contained in:
boyska
Jaromil
parent
25512c5864
commit
6003623fe5
305
src/tomb
305
src/tomb
@ -24,7 +24,7 @@
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# }}}
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# {{{ GLOBAL VARIABLES
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VERSION=1.3
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DATE=Nov/2012
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DATE="Nov/2012"
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TOMBEXEC=$0
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TOMBOPENEXEC="${TOMBEXEC}-open"
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typeset -a OLDARGS
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@ -174,6 +174,8 @@ check_bin() {
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our_pbkdf2="$(dirname $(readlink -f $TOMBEXEC))/kdf/tomb-kdf-pbkdf2"
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if which $our_pbkdf2 &> /dev/null; then
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KDF_PBKDF2=$our_pbkdf2
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else
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KDF_PBKDF2=
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fi
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fi
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@ -270,15 +272,19 @@ ask_password() {
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title="Insert tomb password"
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if [ $2 ]; then title="$2"; fi
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cat <<EOF | GTK2_RC_FILES=${GTK2_RC} pinentry 2>/dev/null | awk '/^D / { sub(/^D /, ""); print }'
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output=`cat <<EOF | GTK2_RC_FILES=${GTK2_RC} pinentry 2>/dev/null | tail -n +7
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OPTION ttyname=$TTY
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OPTION lc-ctype=$LANG
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SETTITLE $title
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SETDESC $1
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SETPROMPT Password:
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GETPIN
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EOF
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EOF`
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if [[ `tail -n1 <<<$output` =~ ERR ]]; then
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return 1
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fi
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head -n1 <<<$output | awk '/^D / { sub(/^D /, ""); print }'
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return 0
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}
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# }}}
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# {{{ - Drop privileges
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@ -301,7 +307,7 @@ check_priv() {
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xxx "Using sudo for root execution of 'tomb ${(f)OLDARGS}'"
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# check if sudo has a timestamp active
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sudok=false
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sudo -n ${TOMBEXEC} &> /dev/null
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# sudo -n ${TOMBEXEC} &> /dev/null
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if ! option_is_set --sudo-pwd; then
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if [ $? != 0 ]; then # if not then ask a password
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cat <<EOF | pinentry 2>/dev/null | awk '/^D / { sub(/^D /, ""); print }' | sudo -S -v
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@ -745,68 +751,14 @@ create_tomb() {
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fi
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_success "Setup your secret key file ${tombkey}"
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# here user is prompted for key password
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if ! option_is_set --tomb-pwd; then
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for c in 1 2 3; do
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# 3 tries to write two times a matching password
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname}"`
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tombpasstmp=$tombpass
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname} (again)"`
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if [ "$tombpasstmp" = "$tombpass" ]; then
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break;
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fi
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unset tombpasstmp
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unset tombpass
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done
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else
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tombpass=`option_value --tomb-pwd`
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fi
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if [ -z $tombpass ]; then
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umount ${keytmp}
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losetup -d $nstloop
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rm -r $keytmp
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die "passwords don't match, aborting operation"
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fi
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_verbose "KDF method chosen is: '`option_value --kdf`'"
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kdf_method=$(cut -d: -f1 <<<`option_value --kdf` )
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case $kdf_method in
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pbkdf2)
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#one parameter: iter time in seconds
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seconds=$(cut -d: -f2 -s <<<`option_value --kdf`)
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if [[ -z $seconds ]]; then
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seconds=1
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fi
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local -i microseconds
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microseconds=$((seconds*1000000))
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_verbose "Microseconds: $microseconds"
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pbkdf2_salt=`${KDF_PBKDF2}-gensalt`
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pbkdf2_iter=`${KDF_PBKDF2}-getiter $microseconds`
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tombpass=`${KDF_PBKDF2} $pbkdf2_salt $pbkdf2_iter 64 <<<${tombpass}` #64bytes=512bits is the key length (huge!)
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header="_KDF_pbkdf2sha1_${pbkdf2_salt}_${pbkdf2_iter}_64\n"
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;;
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""|null)
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header=""
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;;
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*)
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_warning "KDF method non recognized"
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return 1
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header=""
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;;
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esac
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touch $tombkey
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touch ${tombkey}
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chown ${_uid}:${_gid} ${tombkey}
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chmod 0600 ${tombkey}
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( echo -n $header; gpg \
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--openpgp --batch --no-options --no-tty --passphrase-fd 0 2>/dev/null \
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-o - -c -a ${keytmp}/tomb.tmp <<< ${tombpass} ) > $tombkey
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unset tombpass
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gen_key ${keytmp}/tomb.tmp > ${tombkey}
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if ! is_valid_key ${tombkey}; then
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_warning "The key does not seem to be valid"
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fi
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# if [ $? != 0 ]; then
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# _warning "setting password failed: gnupg returns 2"
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# umount ${keytmp}
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@ -853,7 +805,116 @@ create_tomb() {
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_message "done creating $tombname encrypted storage (using Luks dm-crypt ${create_cipher}:sha256)"
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_success "Your tomb is ready in ${tombdir}/${tombfile} and secured with key ${tombkey}"
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}
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#internal use
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#$1 is the keyfile we are checking
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is_valid_key() {
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[[ `file =(awk '/^-+BEGIN/,0' $1) -bi` =~ application/pgp ]]
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return $?
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}
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#internal use
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#$1 is the password, $2 is the keyfile
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#will output the lukskey
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get_lukskey() {
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local tombpass=$1
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keyfile=$2
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firstline=`head -n1 $keyfile`
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if [[ $firstline =~ '^_KDF_' ]]; then
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_verbose "KDF: `cut -d_ -f 3 <<<$firstline`"
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case `cut -d_ -f 3 <<<$firstline` in
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pbkdf2sha1)
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if [[ -z $KDF_PBKDF2 ]]; then
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die "The tomb use kdf method 'pbkdf2', which is unsupported on your system"
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fi
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pbkdf2_param=`cut -d_ -f 4- <<<$firstline | tr '_' ' '`
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tombpass=$(${KDF_PBKDF2} ${=pbkdf2_param} 2> /dev/null <<<$tombpass)
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;;
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*)
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_failure "No suitable program for KDF `cut -f 3 <<<$firstline`"
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unset tombpass
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return 1
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;;
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esac
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fi
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gpg --batch --passphrase-fd 0 --no-tty --no-options \
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-d "${keyfile}" 2> /dev/null <<< ${tombpass}
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ret=$?
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unset tombpass
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return $ret
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}
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#internal use
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#$1 the lukskey to encrypt
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#it respects --kdf and --tomb-pwd
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gen_key() {
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local lukskey=$1
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# here user is prompted for key password
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local tombpass=""
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local tombpasstmp=""
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if ! option_is_set --tomb-pwd; then
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while true; do
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# 3 tries to write two times a matching password
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname}"`
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if [[ $? != 0 ]]; then
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die "User aborted"
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fi
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if [ -z $tombpass ]; then
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_warning "you set empty password, which is not possible"
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continue
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fi
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tombpasstmp=$tombpass
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname} (again)"`
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if [[ $? != 0 ]]; then
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die "User aborted"
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fi
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if [ "$tombpasstmp" = "$tombpass" ]; then
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break;
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fi
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unset tombpasstmp
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unset tombpass
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done
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else
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tombpass=`option_value --tomb-pwd`
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fi
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_verbose "KDF method chosen is: '`option_value --kdf`'"
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kdf_method=$(cut -d: -f1 <<<`option_value --kdf` )
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case $kdf_method in
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pbkdf2)
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if [[ -z $KDF_PBKDF2 ]]; then
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die "The tomb use kdf method 'pbkdf2', which is unsupported on your system"
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fi
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#one parameter: iter time in seconds
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seconds=$(cut -d: -f2 -s <<<`option_value --kdf`)
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if [[ -z $seconds ]]; then
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seconds=1
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fi
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local -i microseconds
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microseconds=$((seconds*1000000))
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_verbose "Microseconds: $microseconds"
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pbkdf2_salt=`${KDF_PBKDF2}-gensalt`
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pbkdf2_iter=`${KDF_PBKDF2}-getiter $microseconds`
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tombpass=`${KDF_PBKDF2} $pbkdf2_salt $pbkdf2_iter 64 <<<"${tombpass}"` #64bytes=512bits is the key length (huge!)
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header="_KDF_pbkdf2sha1_${pbkdf2_salt}_${pbkdf2_iter}_64\n"
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;;
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""|null)
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header=""
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;;
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*)
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_warning "KDF method non recognized"
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return 1
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header=""
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;;
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esac
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echo -n $header
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gpg --openpgp --batch --no-options --no-tty --passphrase-fd 0 2>/dev/null \
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-o - -c -a ${lukskey} <<< "${tombpass}"
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unset tombpass
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}
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# }}}
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@ -969,33 +1030,20 @@ mount_tomb() {
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_warning "Password is required for key ${keyname}"
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for c in 1 2 3; do
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if ! option_is_set --tomb-pwd; then
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if [ $c = 1 ]; then
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Open tomb ${keyname}"`
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else
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Open tomb $keyname (retry $c)"`
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if [[ $? != 0 ]]; then
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die "User aborted"
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fi
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else
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tombpass=`option_value --tomb-pwd`
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fi
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#TODO: read the first line: if it looks like a KDF, do KDF
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firstline=`head -n1 < $tombkey`
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if [[ $firstline =~ '^_KDF_' ]]; then
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_verbose "KDF: `cut -d_ -f 3 <<<$firstline`"
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case `cut -d_ -f 3 <<<$firstline` in
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pbkdf2sha1)
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pbkdf2_param=`cut -d_ -f 4- <<<$firstline | tr '_' ' '`
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tombpass=$(${KDF_PBKDF2} ${=pbkdf2_param} 2> /dev/null <<<$tombpass)
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;;
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*)
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_failure "No suitable program for KDF `cut -f 3 <<<$firstline`"
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return 1
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;;
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esac
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fi
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(gpg --batch --passphrase-fd 0 --no-tty --no-options \
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-d "${tombkey}" 2> /dev/null <<< ${tombpass} ) \
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| cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
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get_lukskey "${tombpass}" ${tombkey} | \
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cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
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local ret=$?
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unset tombpass
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if [[ $ret != 0 ]]; then
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continue
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fi
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# if key was from stdin delete temp file and dir
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if [ $tombkeydir ]; then
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@ -1236,89 +1284,40 @@ change_passwd() {
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return 1
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fi
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file $keyfile | grep PGP > /dev/null
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if [ $? != 0 ]; then
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if ! is_valid_key $keyfile ; then
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_warning "file doesn't seems to be a tomb key: $keyfile"
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_warning "operation aborted."
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return 1
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fi
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local tmpnewkey tmpoldkey c tombpass tombpasstmp
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local tmpnewkey lukskey c tombpass tombpasstmp
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tmpnewkey=`safe_filename tomb`
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tmpoldkey=`safe_filename tomb`
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lukskey=`safe_filename tomb`
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_success "Changing password for $keyfile"
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keyname=`basename $keyfile`
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for c in 1 2 3; do
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if [ $c = 1 ]; then
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while true; do
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Type old password for ${keyname}" "Change tomb key password"`
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else
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Type old password for ${keyname} (retry $c)" "Change tomb key password"`
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if [[ $? == 1 ]]; then
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die "User aborted"
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fi
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gpg --batch --no-options --no-tty --passphrase-fd 0 -o "${tmpoldkey}" -d $keyfile <<< "$tombpass" &> /dev/null
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if [ $? = 0 ]; then
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tombpass="ok"
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if get_lukskey "${tombpass}" ${keyfile} > ${lukskey}; then
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break
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fi
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done
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if [ "$tombpass" != "ok" ]; then
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_warning "You typed an Invalid old password. Operation aborted."
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# /dev/null because the file may not exist
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${=WIPE} "${tmpnewkey}" 2> /dev/null
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${=WIPE} "${tmpoldkey}" 2> /dev/null
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return 1
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fi
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gen_key $lukskey > $tmpnewkey
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for c in 1 2 3; do
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# 3 tries to write two times a matching password
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if [ $c = 1 ]; then
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Type the new password for ${keyname}" "Change tomb key password"`
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else
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Type the new password for ${keyname} (retry $c)" "Change tomb key password"`
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fi
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tombpasstmp=$tombpass
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tombpass=`exec_as_user ${TOMBEXEC} askpass "Type the new password again" "Change tomb key password"`
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if [ "$tombpasstmp" = "$tombpass" ]; then
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break;
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fi
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unset tombpasstmp
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unset tombpass
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done
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if [ -z $tombpass ]; then
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_warning "You mistyped the new password. Operation aborted."
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# /dev/null because the file cannot exists
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${=WIPE} "${tmpnewkey}" 2> /dev/null
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${=WIPE} "${tmpoldkey}" 2> /dev/null
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return 1
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fi
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gpg \
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--openpgp --batch --no-options --no-tty --passphrase-fd 0 \
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-o "${tmpnewkey}" -c -a ${tmpoldkey} <<< ${tombpass}
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unset tombpass
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if [ $? != 0 ]; then
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_warning "Cannot change your key passphrase"
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# /dev/null because the file cannot exists
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${=WIPE} "${tmpnewkey}" 2> /dev/null
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${=WIPE} "${tmpoldkey}" 2> /dev/null
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return 1
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fi
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# wipe the previous, original, key
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${=WIPE} "${keyfile}"
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# copy the new key as the original keyfile name
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cp "${tmpnewkey}" "${keyfile}"
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_message "Cleaning environment"
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if ! is_valid_key $tmpnewkey; then
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# wipe all temp file
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${=WIPE} "${tmpnewkey}"
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${=WIPE} "${tmpoldkey}"
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${=WIPE} "${lukskey}"
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die "Error: the newly generated keyfile does not seem valid"
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fi
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# copy the new key as the original keyfile name
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cp "${tmpnewkey}" "${keyfile}"
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_success "Your passphrase was successfully updated."
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return 0
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@ -1417,9 +1416,8 @@ resize_tomb() {
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else
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tombpass=`exec_as_user ${TOMBEXEC} askpass "$keyname (retry $c)"`
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fi
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(gpg --batch --passphrase-fd 0 --no-tty --no-options \
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-d "${tombkey}" 2> /dev/null <<< ${tombpass} ) \
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| cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
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get_lukskey "${tombpass}" ${tombkey} | \
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cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
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unset tombpass
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@ -1747,7 +1745,7 @@ main() {
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subcommands_opts[open]="f n -nohook=n k: -key=k U: -uid=U G: -gid=G o: -mount-options=o -ignore-swap -sudo-pwd: -tomb-pwd:"
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subcommands_opts[mount]=${subcommands_opts[open]}
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subcommands_opts[create]="f s: -size=s -force k: -key=k U: -uid=U G: -gid=G -ignore-swap -kdf: -sudo-pwd: -tomb-pwd: -use-urandom"
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subcommands_opts[passwd]="f -ignore-swap"
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subcommands_opts[passwd]="f -ignore-swap -kdf: "
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subcommands_opts[close]="-sudo-pwd: U: -uid=U G: -gid=G"
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subcommands_opts[help]=""
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subcommands_opts[slam]=""
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@ -1762,7 +1760,7 @@ main() {
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subcommands_opts[mktemp]=""
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subcommands_opts[source]=""
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subcommands_opts[status]=""
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subcommands_opts[resize]="s: -size=s k: -key=k"
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subcommands_opts[resize]="s: -size=s k: -key=k U: -uid=U G: -gid=G"
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subcommands_opts[check]="-ignore-swap"
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# subcommands_opts[translate]=""
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@ -1862,7 +1860,6 @@ main() {
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umount_tomb $PARAM[1]
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;;
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passwd)
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check_priv
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change_passwd $PARAM[1]
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;;
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list)
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