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last fixes and documentation for release
manual page updates and improvements to kdf argument handling
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Jaromil
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16
ChangeLog
16
ChangeLog
@ -1,4 +1,16 @@
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June 2013 - 1.3.1
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June 2013 - 1.4
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This release fixes an important bug affecting Tomb 1.3.* which
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breaks backward compatibility with older tombs and invalidates
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keys created using 1.3 or 1.3.1. For more information about it
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read the file KNOWN_BUGS. New features are also included:
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indexing and search of file contents, engraving of keys into paper
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printable QRCodes for backup purposes and improvements in key
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encryption. A setkey command is added to change the key file that
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is locking a Tomb. This release restores backward compatibility
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with tombs created before the 1.3 release series.
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June 2013 - 1.3.1 (DEPRECATED USAGE, see 1.4 and KNOWN_BUGS)
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Major bugfixes following the recent refactoring. This release
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fixes various advanced commands as search/index, KDF key
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@ -8,7 +20,7 @@ June 2013 - 1.3.1
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consistent and full paths are honored. A new test suite is
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included and documentation is updated accordingly.
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May 2013 - 1.3
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May 2013 - 1.3 (DEPRECATED USAGE, see 1.4 and KNOWN_BUGS)
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A refactoring of Tomb's main script internals was made, including
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a new messaging system, machine parsable output, cleaner code and
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19
KNOWN_BUGS
Normal file
19
KNOWN_BUGS
Normal file
@ -0,0 +1,19 @@
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* Compatibility broken in Tomb 1.3 and 1.3.1
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Due to an error in the creation and decoding of key files, release
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versions 1.3 and 1.3.1 cannot open older tombs, plus the tombs created
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with them will not be opened with older and newer versions of Tomb.
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This bug was fixed in commit 551a7839f500a9ba4b26cd63774019d91615cb16
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Those who have created tombs with older versions can simply upgrade
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to release 1.4 (and any other following release) to fix this issue
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and be able to operate their tombs normally.
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Those who have used Tomb 1.3 or 1.3.1 to create new tombs should use
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Tomb version 1.3.1 to open them and then migrate the contents into a
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new tomb created using the latest Tomb version.
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This bug was due to a typo in the code which appended a GnuPG status
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string to the content of keys. All users of Tomb 1.3.* should pay
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particular attention to this issue.
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2
README
2
README
@ -12,7 +12,7 @@ X~ `?888888hx~ ...ue888b .888: x888 x888. 8888 .
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' "*88888888* 'Y" `~ " `"` `%888*%"
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^"***"` "`
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A minimalistic commandline tool to manage encrypted volumes v.1.3.1
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A minimalistic commandline tool to manage encrypted volumes v.1.4
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http://tomb.dyne.org
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44
doc/tomb.1
44
doc/tomb.1
@ -1,4 +1,4 @@
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.TH tomb 1 "May 25, 2013" "tomb"
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.TH tomb 1 "June 20, 2013" "tomb"
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.SH NAME
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Tomb \- the Crypto Undertaker
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@ -30,18 +30,23 @@ harddisk and its key file on a USB stick.
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.IP "dig"
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Generates a file that can be used as a tomb and will occupy as much
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space as its desired initial size, the unlocked \fI.tomb\fR file can
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then be locked using a \fI.tomb.key\fR. It takes a mandatory option
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which is the \fI--size\fR in megabytes (MiB). This generation is
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relatively simple: its a data dump (dd) of low-quality random data
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(from /dev/urandom) and does not require root privileges.
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then be locked using a \fIkey\fR. It takes a mandatory option which is
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the \fI--size\fR in megabytes (MiB). Tombs are digged using
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low-quality random data (/dev/urandom).
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.B
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.IP "forge"
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Creates a new \fIkey\fR and prompts the user for a \fIpassword\fR to
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protect its usage. This operation requires high quality random data
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(from /dev/random) which can take quite some time to be gathered on a
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(/dev/random) which can take quite some time to be gathered on a
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server: it works better on a desktop where the mouse can be moved
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around for entropy.
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around for entropy. The default cipher to protect the key is AES256, a
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custom one can be specified using the \fI-o\fR option, for a list of
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supported ciphers use \fI-v\fR. For additional protection against
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dictionary attacks on keys, the (experimental) \fI--kdf\fR option can
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be used when forging a key, making sure that the \fItomb-kdb-pbkdf2\fR
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binaries in \fIextras/kdf\fR were compiled and installed on the
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system.
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.B
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.IP "lock"
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@ -102,13 +107,20 @@ situations.
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.B
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.IP "passwd"
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Changes the password protecting a \fIkey\fR file specified using
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Changes the password protecting a key file specified using
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\fI-k\fR. The user will need to know the key's current password, then
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its content will be decoded and reencoded using the new one. This
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action can't be forced if the current password is not known. If the
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key file is broken (missing headers) this function also attempts its
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recovery.
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.B
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.IP "setkey"
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Changes the key file that locks a tomb, substituting the old one with
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a new one. Both the old and the new key files are needed for this
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operation and their passwords must be known. The new key must be
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specified using the \fI-k\fR option, the first argument should be the old
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key and the second and last argument the tomb file.
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.B
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.IP "resize"
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@ -119,6 +131,15 @@ can never be made smaller. This command makes use of the cryptsetup
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resize feature and the resize2fs command: its much more practical than
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creating a new tomb and moving everything into it.
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.B
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.IP "engrave"
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This command transforms a tomb key into an image that can be printed
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on paper and phisically stored as backup, i.e. hidden in a book. It
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Renders a QRCode of the tomb key, still protected by its password: a
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PNG image (extension \fI.qr.png\fR) will be created in the current
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directory and can be later printed (fits an A4 or Letter format). To
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recover an engraved key one can use any QRCode reader on a smartphone:
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save it into a file and then use that file as a key (\fI-k\fR).
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.B
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.IP "bury"
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@ -152,9 +173,10 @@ other media. If \fI<keyfile>\fR is "-" (dash), it will read it from
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stdin.
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.B
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.IP "--kdf \fI<seconds>\fR"
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Activate the KDF feature against dictionary attacks when creating a key: forces a
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delay of \fI<seconds>\fR every time this key is used. Floating point values
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are accepted, default is 1.
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Activate the KDF feature against dictionary attacks when creating a
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key: forces a delay of \fI<seconds>\fR every time this key is
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used. This feature is still \fIexperimental\fR and not recommended in
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production environments.
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.B
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.IP "-n"
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Skip processing of post-hooks and bind-hooks if found inside the tomb.
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@ -57,7 +57,15 @@ notice "Testing creation: forge"
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tt --ignore-swap --unsecure-dev-mode --tomb-pwd ${dummypass} --use-urandom forge /tmp/test.tomb.key
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{ test $? = 0 } && { results+=(forge SUCCESS) }
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{ test $? = 0 } && {
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results+=(forge SUCCESS)
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#
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say "Dump of clear key contents to examine them:"
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print ${dummypass} \
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| gpg --batch --passphrase-fd 0 --no-tty --no-options -d /tmp/test.tomb.key \
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| hexdump -C
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echo --
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}
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notice "Testing creation: lock"
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29
tomb
29
tomb
@ -270,16 +270,18 @@ Commands:
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list list of open TOMBs and information on them
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close close a specific TOMB (or 'all')
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slam slam a TOMB killing all programs using it
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// Operations on keys:
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passwd change the password of a KEY
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change change the KEY locking a TOMB (needs old one)
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EOF
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if [ "$RESIZER" = 1 ]; then
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cat <<EOF
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resize resize a TOMB to a new --size (can only grow)
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EOF
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fi
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cat <<EOF
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// Operations on keys:
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passwd change the password of a KEY
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setkey change the KEY locking a TOMB (needs old one)
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EOF
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{ test "$QRENCODE" = "1" } && {
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cat <<EOF
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@ -769,16 +771,21 @@ gen_key() {
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fi
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header=""
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{ test "$KDF" = 1 } && {
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{ option_is_set --kdf } && {
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# KDF is a new key strenghtening technique against brute forcing
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# see: https://github.com/dyne/Tomb/issues/82
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itertime="`option_value --kdf`"
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{ test "$itertime" = "" } && { itertime=".5" }
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_verbose "KDF itertime chosen: $itertime"
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# removing support of floating points because they can't be type checked well
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if [[ "$itertime" != <-> ]]; then
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unset tombpass
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unset tombpasstmp
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die "Wrong argument for --kdf: must be an integer number (iteration seconds)"
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fi
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# --kdf takes one parameter: iter time (on present machine) in seconds
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local -i microseconds
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microseconds=$((itertime*1000000))
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_verbose "Microseconds: $microseconds"
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microseconds=$((itertime*10000))
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yes "Using KDF, iterations: $microseconds"
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pbkdf2_salt=`tomb-kdb-pbkdf2-gensalt`
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pbkdf2_iter=`tomb-kdb-pbkdf2-getiter $microseconds`
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# We use a length of 64bytes = 512bits (more than needed!?)
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@ -786,6 +793,7 @@ gen_key() {
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header="_KDF_pbkdf2sha1_${pbkdf2_salt}_${pbkdf2_iter}_64\n"
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}
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}
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print -n $header
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@ -796,6 +804,7 @@ gen_key() {
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-o - -c -a ${lukskey}
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unset tombpass
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unset tombpasstmp
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}
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# prints an array of ciphers available in gnupg (to encrypt keys)
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@ -2147,7 +2156,7 @@ main() {
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subcommands_opts[forge]="f -force -ignore-swap k: -key=k -kdf: o: -tomb-pwd: -use-urandom "
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subcommands_opts[dig]="f -force -ignore-swap s: -size=s "
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subcommands_opts[lock]="f -force -ignore-swap k: -key=k o: -sudo-pwd: -tomb-pwd: "
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subcommands_opts[change]="f -force -ignore-swap k: -key=k -sudo-pwd: -tomb-pwd: "
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subcommands_opts[setkey]="f -force -ignore-swap k: -key=k -sudo-pwd: -tomb-pwd: "
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subcommands_opts[engrave]="k: -key=k "
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subcommands_opts[passwd]="f -ignore-swap -kdf: -tomb-old-pwd: -tomb-pwd: "
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@ -2275,7 +2284,7 @@ main() {
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lock_tomb_with_key ${=PARAM}
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;;
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change)
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setkey)
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check_priv
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change_tomb_key ${=PARAM}
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;;
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