mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-11-25 14:17:41 +00:00
More cleanup and refactoring.
Now most functions are stable. tomb open -k image.jpg can use images directly as keys, works on tests, but needs more debugging.
This commit is contained in:
Jaromil
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5d9caf01e0
commit
16b319c256
106
tomb
106
tomb
@ -58,6 +58,9 @@ MOUNTOPTS="rw,noatime,nodev"
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# prefix for temporary files
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TMPPREFIX="/dev/shm/$$.$RANDOM."
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# makes glob matching case insensitive
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unsetopt CASE_MATCH
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typeset -A global_opts
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typeset -A opts
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typeset -h username
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@ -615,6 +618,42 @@ check_bin() {
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# {{{ Key operations
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# $1 is the encrypted key contents we are checking
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is_valid_key() {
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_verbose "is_valid_key"
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_key="$1"
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# argument check
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{ test "$_key" = "" } && { _key="$tomb_key" }
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{ test "$_key" = "" } && {
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_warning "is_valid_key() called without argument."; return 1 }
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# if the key file is an image don't check file header
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{ test -r "$tomb_key_file" } \
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&& [[ `file "$tomb_key_file"` =~ "JP.G" ]] \
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&& {
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_message "Key is an image, it might be valid."; return 0 }
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[[ "$_key" =~ "BEGIN PGP" ]] && {
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_message "Key is valid."; return 0 }
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return 1
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}
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# $1 is a string containing an encrypted key
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recover_key() {
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_warning "Attempting key recovery."
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_key="$tomb_key"
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tomb_key=""
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[[ "$_key" =~ "_KDF_" ]] && {
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tomb_key+="`print - $_key | $head -n 1`\n" }
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tomb_key+="-----BEGIN PGP MESSAGE-----\n"
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tomb_key+="$_key\n"
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tomb_key+="-----END PGP MESSAGE-----\n"
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return 0
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}
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# This function retrieves a tomb key specified on commandline or from
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# stdin if -k - was selected. It also runs validity checks on the
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# file. On success returns 0 and prints out the full path to
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@ -648,26 +687,13 @@ load_key() {
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_verbose "load_key: ${tomb_key_file}"
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# TODO: move this condition for JPEG steg into is_valid_key
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[[ `file "$tomb_key_file"` =~ "JP.G" ]] || {
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# if the key file is an image don't check file header
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is_valid_key "${tomb_key}" || {
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_warning "The key seems invalid or its format is not known by this version of Tomb."
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# if no BEGIN header found then we try to recover it
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_warning "Attempting recovery."
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_key="$tomb_key"
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tomb_key=""
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[[ "$_key" =~ "_KDF_" ]] && {
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tomb_key+=`print - $_key | $head -n 1` }
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tomb_key+="-----BEGIN PGP MESSAGE-----"
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tomb_key+="$_key"
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tomb_key+="-----END PGP MESSAGE-----"
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}
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recover_key "$tomb_key"
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}
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tomb_key="$tomb_key"
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tomb_key_file="$tomb_key_file"
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# declared tomb_key (contents)
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# declared tomb_key_file (path)
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return 0
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}
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@ -689,11 +715,9 @@ gpg_decrypt() {
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else # using status-file in gpg != 1.4.11
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# TODO: use mkfifo
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tmp_create
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_status=`tmp_new`
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# [[ $? = 0 ]] || {
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# unset gpgpass;
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# _failure "Fatal error creating temp file." }
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tomb_secret=`print - "$gpgpass" | \
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gpg --batch --passphrase-fd 0 --no-tty --no-options \
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@ -738,16 +762,12 @@ get_lukskey() {
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esac
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# key needs to be exhumed from an image
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elif [[ "$tomb_key_file" =~ "JP.G" ]]; then
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tmp_create
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exhumedkey=`tmp_new`
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exhume_key "$tomb_key_file" "$_password" "$exhumedkey"
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tomb_key=`cat $exhumedkey`
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fi
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elif [ -r "$tomb_key_file" ] \
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&& [[ `file "$tomb_key_file"` =~ "JP.G" ]]; then
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# check validity, eventually repair adding headers
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is_valid_key || {
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_failure "This key is unusable: $tomb_key_file" }
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exhume_key "$tomb_key_file" "$_password"
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fi
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gpg_decrypt "$_password" # saves decrypted content into $tomb_secret
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@ -854,24 +874,6 @@ change_passwd() {
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return 0
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}
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# $1 is the encrypted key contents we are checking
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is_valid_key() {
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_verbose "is_valid_key"
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_key="$1"
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# argument check
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{ test "$_key" = "" } && { _key="$tomb_key" }
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{ test "$_key" = "" } && {
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_warning "is_valid_key() called without argument."; return 1 }
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[[ "$_key" =~ "BEGIN PGP" ]] && {
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_message "Key is valid"
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return 0 }
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return 1
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}
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# takes care to encrypt a key
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# honored options: --kdf --tomb-pwd -o
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@ -1048,19 +1050,25 @@ exhume_key() {
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_message "printing exhumed key on stdout" }
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}
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{ test -r "$imagefile" } || {
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_failure "Exhume failed, image file not found: $imagefile" }
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[[ `file "$imagefile"` =~ "JP.G" ]] || {
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_failure "Encode failed: $imagefile is not a jpeg image." }
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_failure "Exhume failed: $imagefile is not a jpeg image." }
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# when a password is passed as argument then always print out
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# the exhumed key on stdout without further checks (internal use)
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{ test "$knownpass" = "" } || {
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steghide extract -sf "$imagefile" -p "$knownpass" -xf -
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tomb_key=`steghide extract -sf "$imagefile" -p "$knownpass" -xf -`
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{ test $? = 0 } || {
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_failure "Wrong password or no steganographic key found" }
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recover_key "$tomb_key"
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return 0
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}
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{ test "$tombkey" = "-" } || {
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if [[ -e "$tombkey" ]]; then
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if [[ -s "$tombkey" ]]; then
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_warning "File exists: $tombkey"
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{ option_is_set -f } || {
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_warning "Make explicit use of --force to overwrite."
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