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30" class="hl">log() {

echo -n "ms: " >&2

echo "$@" >&2

}

loge() {

echo "$@" >&2

}

# cut out all comments(#) and blank lines from standard input

meat() {

grep -v -e "^[[:space:]]*#" -e '^$' "$1"

}

# cut a specified line from standard input

cutline() {

head --line="$1" "$2" | tail -1

}

# check that characters are in a string (in an AND fashion).

# used for checking key capability

# check_capability capability a [b...]

check_capability() {

local usage

local capcheck

usage="$1"

shift 1

for capcheck ; do

if echo "$usage" | grep -q -v "$capcheck" ; then

return 1

fi

done

return 0

}

# convert escaped characters from gpg output back into original

# character

# FIXME: undo all escape character translation in with-colons gpg output

unescape() {

echo "$1" | sed 's/\\x3a/:/'

}

# remove all lines with specified string from specified file

remove_line() {

local file

local string

file="$1"

string="$2"

if [ -z "$file" -o -z "$string" ] ; then

return 1

fi

if [ ! -e "$file" ] ; then

return 1

fi

# if the string is in the file...

if grep -q -F "$string" "$file" 2> /dev/null ; then

# remove the line with the string, and return 0

grep -v -F "$string" "$file" | sponge "$file"

return 0

# otherwise return 1

else

return 1

fi

}

# remove all lines with MonkeySphere strings in file

remove_monkeysphere_lines() {

local file

file="$1"

if [ -z "$file" ] ; then

return 1

fi

if [ ! -e "$file" ] ; then

return 1

fi

egrep -v '^MonkeySphere[[:digit:]]{4}(-[[:digit:]]{2}){2}T[[:digit:]]{2}(:[[:digit:]]{2}){2}$' \

"$file" | sponge "$file"

}

# translate ssh-style path variables %h and %u

translate_ssh_variables() {

local uname

local home

uname="$1"

path="$2"

# get the user's home directory

userHome=$(getent passwd "$uname" | cut -d: -f6)

# translate '%u' to user name

path=${path/\%u/"$uname"}

# translate '%h' to user home directory

path=${path/\%h/"$userHome"}

echo "$path"

}

# test that a string to conforms to GPG's expiration format

test_gpg_expire() {

echo "$1" | egrep -q "^[0-9]+[mwy]?$"

}

# check that a file is properly owned, and that all it's parent

# directories are not group/other writable

check_key_file_permissions() {

local user

local path

local access

local gAccess

local oAccess

# function to check that an octal corresponds to writability

is_write() {

[ "$1" -eq 2 -o "$1" -eq 3 -o "$1" -eq 6 -o "$1" -eq 7 ]

}

user="$1"

path="$2"

# return 0 is path does not exist

[ -e "$path" ] || return 0

owner=$(stat --format '%U' "$path")

access=$(stat --format '%a' "$path")

gAccess=$(echo "$access" | cut -c2)

oAccess=$(echo "$access" | cut -c3)

# check owner

if [ "$owner" != "$user" -a "$owner" != 'root' ] ; then

return 1

fi

# check group/other writability

if is_write "$gAccess" || is_write "$oAccess" ; then

return 2

fi

if [ "$path" = '/' ] ; then

return 0

else

check_key_file_permissions $(dirname "$path")

fi

}

### CONVERSION UTILITIES

# output the ssh key for a given key ID

gpg2ssh() {

local keyID

keyID="$1"

gpg --export "$keyID" | openpgp2ssh "$keyID" 2> /dev/null

}

# output known_hosts line from ssh key

ssh2known_hosts() {

local host

local key

host="$1"

key="$2"

echo -n "$host "

echo -n "$key" | tr -d '\n'

echo " MonkeySphere${DATE}"

}

# output authorized_keys line from ssh key

ssh2authorized_keys() {

local userID

local key

userID="$1"

key="$2"

echo -n "$key" | tr -d '\n'

echo " MonkeySphere${DATE} ${userID}"

}

# convert key from gpg to ssh known_hosts format

gpg2known_hosts() {

local host

local keyID

host="$1"

keyID="$2"

# NOTE: it seems that ssh-keygen -R removes all comment fields from

# all lines in the known_hosts file. why?

# NOTE: just in case, the COMMENT can be matched with the

# following regexp:

# '^MonkeySphere[[:digit:]]{4}(-[[:digit:]]{2}){2}T[[:digit:]]{2}(:[[:digit:]]{2}){2}$'

echo -n "$host "

gpg2ssh "$keyID" | tr -d '\n'

echo " MonkeySphere${DATE}"

}

# convert key from gpg to ssh authorized_keys format

gpg2authorized_keys() {

local userID

local keyID

userID="$1"

keyID="$2"

# NOTE: just in case, the COMMENT can be matched with the

# following regexp:

# '^MonkeySphere[[:digit:]]{4}(-[[:digit:]]{2}){2}T[[:digit:]]{2}(:[[:digit:]]{2}){2}$'

gpg2ssh "$keyID" | tr -d '\n'

echo " MonkeySphere${DATE} ${userID}"

}

### GPG UTILITIES

# retrieve all keys with given user id from keyserver

# FIXME: need to figure out how to retrieve all matching keys

# (not just first N (5 in this case))

gpg_fetch_userid() {

local userID

local returnCode

if [ "$CHECK_KEYSERVER" != 'true' ] ; then

return 0

fi

userID="$1"

log -n " checking keyserver $KEYSERVER... "

echo 1,2,3,4,5 | \

gpg --quiet --batch --with-colons \

--command-fd 0 --keyserver "$KEYSERVER" \

--search ="$userID" > /dev/null 2>&1

returnCode="$?"

loge "done."

# if the user is the monkeysphere user, then update the

# monkeysphere user's trustdb

if [ $(id -un) = "$MONKEYSPHERE_USER" ] ; then

gpg_authentication "--check-trustdb" > /dev/null 2>&1

fi

return "$returnCode"

}

########################################################################

### PROCESSING FUNCTIONS

# userid and key policy checking

# the following checks policy on the returned keys

# - checks that full key has appropriate valididy (u|f)

# - checks key has specified capability (REQUIRED_*_KEY_CAPABILITY)

# - checks that requested user ID has appropriate validity

# (see /usr/share/doc/gnupg/DETAILS.gz)

# output is one line for every found key, in the following format:

#

# flag fingerprint

#

# "flag" is an acceptability flag, 0 = ok, 1 = bad

# "fingerprint" is the fingerprint of the key

#

# expects global variable: "MODE"

process_user_id() {

local userID

local requiredCapability

local requiredPubCapability

local gpgOut

local type

local validity

local keyid

local uidfpr

local usage

local keyOK

local uidOK

local lastKey

local lastKeyOK

local fingerprint

userID="$1"

# set the required key capability based on the mode

if [ "$MODE" = 'known_hosts' ] ; then

requiredCapability="$REQUIRED_HOST_KEY_CAPABILITY"

elif [ "$MODE" = 'authorized_keys' ] ; then

requiredCapability="$REQUIRED_USER_KEY_CAPABILITY"

fi

requiredPubCapability=$(echo "$requiredCapability" | tr "[:lower:]" "[:upper:]")

# fetch the user ID if necessary/requested

gpg_fetch_userid "$userID"

# output gpg info for (exact) userid and store

gpgOut=$(gpg --list-key --fixed-list-mode --with-colon \

--with-fingerprint --with-fingerprint \

="$userID" 2>/dev/null)

# if the gpg query return code is not 0, return 1

if [ "$?" -ne 0 ] ; then

log " no primary keys found."

return 1

fi

# loop over all lines in the gpg output and process.

echo "$gpgOut" | cut -d: -f1,2,5,10,12 | \

while IFS=: read -r type validity keyid uidfpr usage ; do

# process based on record type

case $type in

'pub') # primary keys

# new key, wipe the slate

keyOK=

uidOK=

lastKey=pub

lastKeyOK=

fingerprint=

log " primary key found: $keyid"

# if overall key is not valid, skip

if [ "$validity" != 'u' -a "$validity" != 'f' ] ; then

log " - unacceptable primary key validity ($validity)."

continue

fi

# if overall key is disabled, skip

if check_capability "$usage" 'D' ; then

log " - key disabled."

continue

fi

# if overall key capability is not ok, skip

if ! check_capability "$usage" $requiredPubCapability ; then

log " - unacceptable primary key capability ($usage)."

continue

fi

# mark overall key as ok

keyOK=true

# mark primary key as ok if capability is ok

if check_capability "$usage" $requiredCapability ; then

lastKeyOK=true

fi

;;

'uid') # user ids

# if an acceptable user ID was already found, skip

if [ "$uidOK" ] ; then

continue

fi

# if the user ID does not match, skip

if [ "$(unescape "$uidfpr")" != "$userID" ] ; then

continue

fi

# if the user ID validity is not ok, skip

if [ "$validity" != 'u' -a "$validity" != 'f' ] ; then

continue

fi

# mark user ID acceptable

uidOK=true

# output a line for the primary key

# 0 = ok, 1 = bad

if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then

log " * acceptable primary key."

if [ -z "$sshKey" ] ; then

log " ! primary key could not be translated."

else

echo "0:${sshKey}"

fi

else

log " - unacceptable primary key."

if [ -z "$sshKey" ] ; then

log " ! primary key could not be translated."

else

echo "1:${sshKey}"

fi

fi

;;

'sub') # sub keys

# unset acceptability of last key

lastKey=sub

lastKeyOK=

fingerprint=

# if sub key validity is not ok, skip

if [ "$validity" != 'u' -a "$validity" != 'f' ] ; then

continue

fi

# if sub key capability is not ok, skip

if ! check_capability "$usage" $requiredCapability ; then

continue

fi

# mark sub key as ok

lastKeyOK=true

;;

'fpr') # key fingerprint

fingerprint="$uidfpr"

sshKey=$(gpg2ssh "$fingerprint")

# if the last key was the pub key, skip

if [ "$lastKey" = pub ] ; then

continue

fi

# output a line for the primary key

# 0 = ok, 1 = bad

if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then

log " * acceptable sub key."

if [ -z "$sshKey" ] ; then

log " ! sub key could not be translated."

else

echo "0:${sshKey}"

fi

else

log " - unacceptable sub key."

if [ -z "$sshKey" ] ; then

log " ! sub key could not be translated."

else

echo "1:${sshKey}"

fi

fi

;;

esac

done

}

# process a single host in the known_host file

process_host_known_hosts() {

local host

local userID

local nKeys

local nKeysOK

local ok

local sshKey

local tmpfile

host="$1"

log "processing: $host"

userID="ssh://${host}"

nKeys=0

nKeysOK=0

IFS=$'\n'

for line in $(process_user_id "ssh://${host}") ; do

# note that key was found

nKeys=$((nKeys+1))

ok=$(echo "$line" | cut -d: -f1)

sshKey=$(echo "$line" | cut -d: -f2)

if [ -z "$sshKey" ] ; then

continue

fi

# remove the old host key line, and note if removed

remove_line "$KNOWN_HOSTS" "$sshKey"

# if key OK, add new host line

if [ "$ok" -eq '0' ] ; then

# note that key was found ok

nKeysOK=$((nKeysOK+1))

# hash if specified

if [ "$HASH_KNOWN_HOSTS" = 'true' ] ; then

# FIXME: this is really hackish cause ssh-keygen won't

# hash from stdin to stdout

tmpfile=$(mktemp)

ssh2known_hosts "$host" "$sshKey" > "$tmpfile"

ssh-keygen -H -f "$tmpfile" 2> /dev/null

cat "$tmpfile" >> "$KNOWN_HOSTS"

rm -f "$tmpfile" "${tmpfile}.old"

else

ssh2known_hosts "$host" "$sshKey" >> "$KNOWN_HOSTS"

fi

fi

done

# if at least one key was found...

if [ "$nKeys" -gt 0 ] ; then

# if ok keys were found, return 0

if [ "$nKeysOK" -gt 0 ] ; then

return 0

# else return 2

else

return 2

fi

# if no keys were found, return 1

else

return 1

fi

}

# update the known_hosts file for a set of hosts listed on command

# line

update_known_hosts() {

local nHosts

local nHostsOK

local nHostsBAD

local fileCheck

local host

# the number of hosts specified on command line

nHosts="$#"

nHostsOK=0

nHostsBAD=0

# set the trap to remove any lockfiles on exit

trap "lockfile-remove $KNOWN_HOSTS" EXIT

# create a lockfile on known_hosts

lockfile-create "$KNOWN_HOSTS"

# note pre update file checksum

fileCheck="$(cat "$KNOWN_HOSTS" | md5sum)"

for host ; do

# process the host

process_host_known_hosts "$host"

# note the result

case "$?" in

0)

nHostsOK=$((nHostsOK+1))

;;

2)

nHostsBAD=$((nHostsBAD+1))

;;

esac

# touch the lockfile, for good measure.

lockfile-touch --oneshot "$KNOWN_HOSTS"

done

# remove the lockfile

lockfile-remove "$KNOWN_HOSTS"

# note if the known_hosts file was updated

if [ "$(cat "$KNOWN_HOSTS" | md5sum)" != "$fileCheck" ] ; then

log "known_hosts file updated."

fi

# if an acceptable host was found, return 0

if [ "$nHostsOK" -gt 0 ] ; then

return 0

# else if no ok hosts were found...

else

# if no bad host were found then no hosts were found at all,

# and return 1

if [ "$nHostsBAD" -eq 0 ] ; then

return 1

# else if at least one bad host was found, return 2

else

return 2

fi

fi

}

# process hosts from a known_hosts file

process_known_hosts() {

local hosts

log "processing known_hosts file..."

hosts=$(meat "$KNOWN_HOSTS" | cut -d ' ' -f 1 | grep -v '^|.*$' | tr , ' ' | tr '\n' ' ')

if [ -z "$hosts" ] ; then

log "no hosts to process."

return

fi

# take all the hosts from the known_hosts file (first

# field), grep out all the hashed hosts (lines starting

# with '|')...

update_known_hosts $hosts

}

# process uids for the authorized_keys file

process_uid_authorized_keys() {

local userID

local nKeys

local nKeysOK

local ok

local sshKey

userID="$1"

log "processing: $userID"

nKeys=0

nKeysOK=0

IFS=$'\n'

for line in $(process_user_id "$userID") ; do

# note that key was found

nKeys=$((nKeys+1))

ok=$(echo "$line" | cut -d: -f1)

sshKey=$(echo "$line" | cut -d: -f2)

if [ -z "$sshKey" ] ; then

continue

fi

# remove the old host key line

remove_line "$AUTHORIZED_KEYS" "$sshKey"

# if key OK, add new host line

if [ "$ok" -eq '0' ] ; then

# note that key was found ok

nKeysOK=$((nKeysOK+1))

ssh2authorized_keys "$userID" "$sshKey" >> "$AUTHORIZED_KEYS"

fi

done

# if at least one key was found...

if [ "$nKeys" -gt 0 ] ; then

# if ok keys were found, return 0

if [ "$nKeysOK" -gt 0 ] ; then

return 0

# else return 2

else

return 2

fi

# if no keys were found, return 1

else

return 1

fi

}

# update the authorized_keys files from a list of user IDs on command

# line

update_authorized_keys() {

local userID

local nIDs

local nIDsOK

local nIDsBAD

local fileCheck

# the number of ids specified on command line

nIDs="$#"

nIDsOK=0

nIDsBAD=0

# set the trap to remove any lockfiles on exit

trap "lockfile-remove $AUTHORIZED_KEYS" EXIT

# create a lockfile on authorized_keys

lockfile-create "$AUTHORIZED_KEYS"

# note pre update file checksum

fileCheck="$(cat "$AUTHORIZED_KEYS" | md5sum)"

# remove any monkeysphere lines from authorized_keys file

remove_monkeysphere_lines "$AUTHORIZED_KEYS"

for userID ; do

# process the user ID, change return code if key not found for

# user ID

process_uid_authorized_keys "$userID"

# note the result

case "$?" in

0)

nIDsOK=$((nIDsOK+1))

;;

2)

nIDsBAD=$((nIDsBAD+1))

;;

esac

# touch the lockfile, for good measure.

lockfile-touch --oneshot "$AUTHORIZED_KEYS"

done

# remove the lockfile

lockfile-remove "$AUTHORIZED_KEYS"

# note if the authorized_keys file was updated

if [ "$(cat "$AUTHORIZED_KEYS" | md5sum)" != "$fileCheck" ] ; then

log "authorized_keys file updated."

fi

# if an acceptable id was found, return 0

if [ "$nIDsOK" -gt 0 ] ; then

return 0

# else if no ok ids were found...

else

# if no bad ids were found then no ids were found at all, and

# return 1

if [ "$nIDsBAD" -eq 0 ] ; then

return 1

# else if at least one bad id was found, return 2

else

return 2

fi

fi

}

# process an authorized_user_ids file for authorized_keys

process_authorized_user_ids() {

local line

local nline

local userIDs

authorizedUserIDs="$1"

log "processing authorized_user_ids file..."

if ! meat "$authorizedUserIDs" > /dev/null ; then

log "no user IDs to process."

return

fi

nline=0

# extract user IDs from authorized_user_ids file

IFS=$'\n'

for line in $(meat "$authorizedUserIDs") ; do

userIDs["$nline"]="$line"

nline=$((nline+1))

done

update_authorized_keys "${userIDs[@]}"

}