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+# -*-shell-script-*-
+# This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)
+
+# Shared sh functions for the monkeysphere
+#
+# Written by
+# Jameson Rollins <jrollins@finestructure.net>
+# Jamie McClelland <jm@mayfirst.org>
+# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# Copyright 2008, released under the GPL, version 3 or later
+
+# all-caps variables are meant to be user supplied (ie. from config
+# file) and are considered global
+
+########################################################################
+### COMMON VARIABLES
+
+# managed directories
+SYSCONFIGDIR=${MONKEYSPHERE_SYSCONFIGDIR:-"/etc/monkeysphere"}
+export SYSCONFIGDIR
+
+# monkeysphere version
+VERSION=__VERSION__
+
+########################################################################
+### UTILITY FUNCTIONS
+
+# failure function. exits with code 255, unless specified otherwise.
+failure() {
+ [ "$1" ] && echo "$1" >&2
+ exit ${2:-'255'}
+}
+
+# write output to stderr based on specified LOG_LEVEL the first
+# parameter is the priority of the output, and everything else is what
+# is echoed to stderr
+log() {
+ local priority
+ local level
+ local output
+ local alllevels
+ local found=
+
+ # don't include SILENT in alllevels: it's handled separately
+ # list in decreasing verbosity (all caps).
+ # separate with $IFS explicitly, since we do some fancy footwork
+ # elsewhere.
+ alllevels="DEBUG${IFS}VERBOSE${IFS}INFO${IFS}ERROR"
+
+ # translate lowers to uppers in global log level
+ LOG_LEVEL=$(echo "$LOG_LEVEL" | tr "[:lower:]" "[:upper:]")
+
+ # just go ahead and return if the log level is silent
+ if [ "$LOG_LEVEL" = 'SILENT' ] ; then
+ return
+ fi
+
+ for level in $alllevels ; do
+ if [ "$LOG_LEVEL" = "$level" ] ; then
+ found=true
+ fi
+ done
+ if [ -z "$found" ] ; then
+ # default to INFO:
+ LOG_LEVEL=INFO
+ fi
+
+ # get priority from first parameter, translating all lower to
+ # uppers
+ priority=$(echo "$1" | tr "[:lower:]" "[:upper:]")
+ shift
+
+ # scan over available levels
+ for level in $alllevels ; do
+ # output if the log level matches, set output to true
+ # this will output for all subsequent loops as well.
+ if [ "$LOG_LEVEL" = "$level" ] ; then
+ output=true
+ fi
+ if [ "$priority" = "$level" -a "$output" = 'true' ] ; then
+ echo -n "ms: " >&2
+ echo "$@" >&2
+ fi
+ done
+}
+
+# cut out all comments(#) and blank lines from standard input
+meat() {
+ grep -v -e "^[[:space:]]*#" -e '^$' "$1"
+}
+
+# cut a specified line from standard input
+cutline() {
+ head --line="$1" "$2" | tail -1
+}
+
+# this is a wrapper for doing lock functions.
+#
+# it lets us depend on either lockfile-progs (preferred) or procmail's
+# lockfile, and should
+lock() {
+ local use_lockfileprogs=true
+ local action="$1"
+ local file="$2"
+
+ if ! ( which lockfile-create >/dev/null 2>/dev/null ) ; then
+ if ! ( which lockfile >/dev/null ); then
+ failure "Neither lockfile-create nor lockfile are in the path!"
+ fi
+ use_lockfileprogs=
+ fi
+
+ case "$action" in
+ create)
+ if [ -n "$use_lockfileprogs" ] ; then
+ lockfile-create "$file" || failure "unable to lock '$file'"
+ else
+ lockfile -r 20 "${file}.lock" || failure "unable to lock '$file'"
+ fi
+ ;;
+ touch)
+ if [ -n "$use_lockfileprogs" ] ; then
+ lockfile-touch --oneshot "$file"
+ else
+ : Nothing to do here
+ fi
+ ;;
+ remove)
+ if [ -n "$use_lockfileprogs" ] ; then
+ lockfile-remove "$file"
+ else
+ rm -f "${file}.lock"
+ fi
+ ;;
+ *)
+ failure "bad argument for lock subfunction '$action'"
+ esac
+}
+
+
+# for portability, between gnu date and BSD date.
+# arguments should be: number longunits format
+
+# e.g. advance_date 20 seconds +%F
+advance_date() {
+ local gnutry
+ local number="$1"
+ local longunits="$2"
+ local format="$3"
+ local shortunits
+
+ # try things the GNU way first
+ if date -d "$number $longunits" "$format" >/dev/null 2>&1; then
+ date -d "$number $longunits" "$format"
+ else
+ # otherwise, convert to (a limited version of) BSD date syntax:
+ case "$longunits" in
+ years)
+ shortunits=y
+ ;;
+ months)
+ shortunits=m
+ ;;
+ weeks)
+ shortunits=w
+ ;;
+ days)
+ shortunits=d
+ ;;
+ hours)
+ shortunits=H
+ ;;
+ minutes)
+ shortunits=M
+ ;;
+ seconds)
+ shortunits=S
+ ;;
+ *)
+ # this is a longshot, and will likely fail; oh well.
+ shortunits="$longunits"
+ esac
+ date "-v+${number}${shortunits}" "$format"
+ fi
+}
+
+
+# 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
+}
+
+# hash of a file
+file_hash() {
+ md5sum "$1" 2> /dev/null
+}
+
+# convert escaped characters in pipeline from gpg output back into
+# original character
+# FIXME: undo all escape character translation in with-colons gpg
+# output
+gpg_unescape() {
+ sed 's/\\x3a/:/g'
+}
+
+# convert nasty chars into gpg-friendly form in pipeline
+# FIXME: escape everything, not just colons!
+gpg_escape() {
+ sed 's/:/\\x3a/g'
+}
+
+# prompt for GPG-formatted expiration, and emit result on stdout
+get_gpg_expiration() {
+ local keyExpire
+
+ keyExpire="$1"
+
+ if [ -z "$keyExpire" ]; then
+ cat >&2 <<EOF
+Please specify how long the key should be valid.
+ 0 = key does not expire
+ <n> = key expires in n days
+ <n>w = key expires in n weeks
+ <n>m = key expires in n months
+ <n>y = key expires in n years
+EOF
+ while [ -z "$keyExpire" ] ; do
+ read -p "Key is valid for? (0) " keyExpire
+ if ! test_gpg_expire ${keyExpire:=0} ; then
+ echo "invalid value" >&2
+ unset keyExpire
+ fi
+ done
+ elif ! test_gpg_expire "$keyExpire" ; then
+ failure "invalid key expiration value '$keyExpire'."
+ fi
+
+ echo "$keyExpire"
+}
+
+passphrase_prompt() {
+ local prompt="$1"
+ local fifo="$2"
+ local PASS
+
+ if [ "$DISPLAY" ] && which "${SSH_ASKPASS:-ssh-askpass}" >/dev/null; then
+ "${SSH_ASKPASS:-ssh-askpass}" "$prompt" > "$fifo"
+ else
+ read -s -p "$prompt" PASS
+ # Uses the builtin echo, so should not put the passphrase into
+ # the process table. I think. --dkg
+ echo "$PASS" > "$fifo"
+ fi
+}
+
+test_gnu_dummy_s2k_extension() {
+
+# this block contains a demonstration private key that has had the
+# primary key stripped out using the GNU S2K extension known as
+# "gnu-dummy" (see /usr/share/doc/gnupg/DETAILS.gz). The subkey is
+# present in cleartext, however.
+
+# openpgp2ssh will be able to deal with this based on whether the
+# local copy of GnuTLS contains read_s2k support that can handle it.
+
+# read up on that here:
+
+# http://lists.gnu.org/archive/html/gnutls-devel/2008-08/msg00005.html
+
+echo "
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.9 (GNU/Linux)
+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+=CR5w
+-----END PGP PRIVATE KEY BLOCK-----
+" | openpgp2ssh 4129E89D17C1D591 >/dev/null 2>/dev/null
+
+}
+
+# remove all lines with specified string from specified file
+remove_line() {
+ local file
+ local string
+ local tempfile
+
+ 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
+ tempfile=$(mktemp "${file}.XXXXXXX") || \
+ failure "Unable to make temp file '${file}.XXXXXXX'"
+
+ # remove the line with the string, and return 0
+ grep -v -F "$string" "$file" >"$tempfile"
+ cat "$tempfile" > "$file"
+ rm "$tempfile"
+ return 0
+ # otherwise return 1
+ else
+ return 1
+ fi
+}
+
+# remove all lines with MonkeySphere strings in file
+remove_monkeysphere_lines() {
+ local file
+ local tempfile
+
+ file="$1"
+
+ if [ -z "$file" ] ; then
+ return 1
+ fi
+
+ if [ ! -e "$file" ] ; then
+ return 1
+ fi
+
+ tempfile=$(mktemp "${file}.XXXXXXX") || \
+ failure "Could not make temporary file '${file}.XXXXXXX'."
+
+ egrep -v '^MonkeySphere[[:digit:]]{4}(-[[:digit:]]{2}){2}T[[:digit:]]{2}(:[[:digit:]]{2}){2}$' \
+ "$file" >"$tempfile"
+ cat "$tempfile" > "$file"
+ rm "$tempfile"
+}
+
+# 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 uname
+ local path
+ local stat
+ local access
+ local gAccess
+ local oAccess
+
+ # function to check that the given permission corresponds to writability
+ is_write() {
+ [ "$1" = "w" ]
+ }
+
+ uname="$1"
+ path="$2"
+
+ # return 255 if cannot stat file
+ if ! stat=$(ls -ld "$path" 2>/dev/null) ; then
+ log error "could not stat path '$path'."
+ return 255
+ fi
+
+ owner=$(echo "$stat" | awk '{ print $3 }')
+ gAccess=$(echo "$stat" | cut -c6)
+ oAccess=$(echo "$stat" | cut -c9)
+
+ # return 1 if path has invalid owner
+ if [ "$owner" != "$uname" -a "$owner" != 'root' ] ; then
+ log error "improper ownership on path '$path'."
+ return 1
+ fi
+
+ # return 2 if path has group or other writability
+ if is_write "$gAccess" || is_write "$oAccess" ; then
+ log error "improper group or other writability on path '$path'."
+ return 2
+ fi
+
+ # return zero if all clear, or go to next path
+ if [ "$path" = '/' ] ; then
+ return 0
+ else
+ check_key_file_permissions "$uname" $(dirname "$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 verbose " checking keyserver $KEYSERVER... "
+ echo 1,2,3,4,5 | \
+ gpg --quiet --batch --with-colons \
+ --command-fd 0 --keyserver "$KEYSERVER" \
+ --search ="$userID" > /dev/null 2>&1
+ returnCode="$?"
+
+ # 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:sshKey
+#
+# "flag" is an acceptability flag, 0 = ok, 1 = bad
+# "sshKey" is the translated gpg key
+#
+# all log output must go to stderr, as stdout is used to pass the
+# flag:sshKey to the calling function.
+#
+# 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 [ "$?" -ne 0 ] ; then
+ log verbose " no primary keys found."
+ return 1
+ fi
+
+ # loop over all lines in the gpg output and process.
+ echo "$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 verbose " primary key found: $keyid"
+
+ # if overall key is not valid, skip
+ if [ "$validity" != 'u' -a "$validity" != 'f' ] ; then
+ log debug " - unacceptable primary key validity ($validity)."
+ continue
+ fi
+ # if overall key is disabled, skip
+ if check_capability "$usage" 'D' ; then
+ log debug " - key disabled."
+ continue
+ fi
+ # if overall key capability is not ok, skip
+ if ! check_capability "$usage" $requiredPubCapability ; then
+ log debug " - unacceptable primary key capability ($usage)."
+ continue
+ fi
+
+ # mark overall key as ok
+ keyOK=true
+
+ # mark primary key as ok if capability is ok
+ if check_capability "$usage" $requiredCapability ; then
+ lastKeyOK=true
+ fi
+ ;;
+ 'uid') # user ids
+ if [ "$lastKey" != pub ] ; then
+ log verbose " ! got a user ID after a sub key?! user IDs should only follow primary keys!"
+ continue
+ fi
+ # if an acceptable user ID was already found, skip
+ if [ "$uidOK" = 'true' ] ; then
+ continue
+ fi
+ # if the user ID does matches...
+ if [ "$(echo "$uidfpr" | gpg_unescape)" = "$userID" ] ; then
+ # and the user ID validity is ok
+ if [ "$validity" = 'u' -o "$validity" = 'f' ] ; then
+ # mark user ID acceptable
+ uidOK=true
+ else
+ log debug " - unacceptable user ID validity ($validity)."
+ fi
+ else
+ continue
+ fi
+
+ # output a line for the primary key
+ # 0 = ok, 1 = bad
+ if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then
+ log verbose " * acceptable primary key."
+ if [ -z "$sshKey" ] ; then
+ log error " ! primary key could not be translated (not RSA or DSA?)."
+ else
+ echo "0:${sshKey}"
+ fi
+ else
+ log debug " - unacceptable primary key."
+ if [ -z "$sshKey" ] ; then
+ log debug " ! primary key could not be translated (not RSA or DSA?)."
+ else
+ echo "1:${sshKey}"
+ fi
+ fi
+ ;;
+ 'sub') # sub keys
+ # unset acceptability of last key
+ lastKey=sub
+ lastKeyOK=
+ fingerprint=
+
+ # don't bother with sub keys if the primary key is not valid
+ if [ "$keyOK" != true ] ; then
+ continue
+ fi
+
+ # don't bother with sub keys if no user ID is acceptable:
+ if [ "$uidOK" != true ] ; then
+ continue
+ fi
+
+ # if sub key validity is not ok, skip
+ if [ "$validity" != 'u' -a "$validity" != 'f' ] ; then
+ log debug " - unacceptable sub key validity ($validity)."
+ continue
+ fi
+ # if sub key capability is not ok, skip
+ if ! check_capability "$usage" $requiredCapability ; then
+ log debug " - unacceptable sub key capability ($usage)."
+ 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 sub key
+ # 0 = ok, 1 = bad
+ if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then
+ log verbose " * acceptable sub key."
+ if [ -z "$sshKey" ] ; then
+ log error " ! sub key could not be translated (not RSA or DSA?)."
+ else
+ echo "0:${sshKey}"
+ fi
+ else
+ log debug " - unacceptable sub key."
+ if [ -z "$sshKey" ] ; then
+ log debug " ! sub key could not be translated (not RSA or DSA?)."
+ else
+ echo "1:${sshKey}"
+ fi
+ fi
+ ;;
+ esac
+ done | sort -t: -k1 -n -r
+ # NOTE: this last sort is important so that the "good" keys (key
+ # flag '0') come last. This is so that they take precedence when
+ # being processed in the key files over "bad" keys (key flag '1')
+}
+
+# process a single host in the known_host file
+process_host_known_hosts() {
+ local host
+ local userID
+ local noKey=
+ local nKeys
+ local nKeysOK
+ local ok
+ local sshKey
+ local tmpfile
+
+ host="$1"
+ userID="ssh://${host}"
+
+ log verbose "processing: $host"
+
+ nKeys=0
+ nKeysOK=0
+
+ IFS=$'\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 any old host key line, and note if removed nothing is
+ # removed
+ remove_line "$KNOWN_HOSTS" "$sshKey" || noKey=true
+
+ # 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 ${TMPDIR:-/tmp}/tmp.XXXXXXXXXX)
+ ssh2known_hosts "$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
+
+ # log if this is a new key to the known_hosts file
+ if [ "$noKey" ] ; then
+ log info "* new key for $host added to known_hosts file."
+ fi
+ fi
+ done
+
+ # if at least one key was found...
+ if [ "$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
+
+ # create a lockfile on known_hosts:
+ lock create "$KNOWN_HOSTS"
+ # FIXME: we're discarding any pre-existing EXIT trap; is this bad?
+ trap "lock remove $KNOWN_HOSTS" EXIT
+
+ # note pre update file checksum
+ fileCheck="$(file_hash "$KNOWN_HOSTS")"
+
+ for host ; do
+ # process the host
+ process_host_known_hosts "$host"
+ # note the result
+ case "$?" in
+ 0)
+ nHostsOK=$((nHostsOK+1))
+ ;;
+ 2)
+ nHostsBAD=$((nHostsBAD+1))
+ ;;
+ esac
+
+ # touch the lockfile, for good measure.
+ lock touch "$KNOWN_HOSTS"
+ done
+
+ # remove the lockfile and the trap
+ lock remove "$KNOWN_HOSTS"
+ trap - EXIT
+
+ # note if the known_hosts file was updated
+ if [ "$(file_hash "$KNOWN_HOSTS")" != "$fileCheck" ] ; then
+ log debug "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 debug "processing known_hosts file..."
+
+ hosts=$(meat "$KNOWN_HOSTS" | cut -d ' ' -f 1 | grep -v '^|.*$' | tr , ' ' | tr '\n' ' ')
+
+ if [ -z "$hosts" ] ; then
+ log debug "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 verbose "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
+
+ # create a lockfile on authorized_keys
+ lock create "$AUTHORIZED_KEYS"
+ # FIXME: we're discarding any pre-existing EXIT trap; is this bad?
+ trap "lock remove $AUTHORIZED_KEYS" EXIT
+
+ # note pre update file checksum
+ fileCheck="$(file_hash "$AUTHORIZED_KEYS")"
+
+ # remove any monkeysphere lines from authorized_keys file
+ remove_monkeysphere_lines "$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.
+ lock touch "$AUTHORIZED_KEYS"
+ done
+
+ # remove the lockfile and the trap
+ lock remove "$AUTHORIZED_KEYS"
+ trap - EXIT
+
+ # note if the authorized_keys file was updated
+ if [ "$(file_hash "$AUTHORIZED_KEYS")" != "$fileCheck" ] ; then
+ log debug "authorized_keys file updated."
+ fi
+
+ # if an acceptable id was found, return 0
+ if [ "$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="$1"
+
+ log debug "processing authorized_user_ids file..."
+
+ if ! meat "$authorizedUserIDs" > /dev/null ; then
+ log debug " 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[@]}"
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-28 06:55:32 +0000