X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=src%2Fcommon;h=01e52b8b86c44b11d13ce6a7001498cb7923ea78;hb=927efbbbbb1477658a350d4aa2ba49d6d2d2842b;hp=00ee7b04a124db6679959c35b5c000b2e9ea2389;hpb=1fa2912aac2636bc6a4d8eda089c0e285f88d141;p=monkeysphere.git diff --git a/src/common b/src/common index 00ee7b0..01e52b8 100644 --- a/src/common +++ b/src/common @@ -16,12 +16,15 @@ # managed directories ETC="/etc/monkeysphere" export ETC -CACHE="/var/cache/monkeysphere" -export CACHE ######################################################################## ### UTILITY FUNCTIONS +error() { + log "$1" + ERR=${2:-'1'} +} + failure() { echo "$1" >&2 exit ${2:-'1'} @@ -29,22 +32,22 @@ failure() { # write output to stderr log() { - echo -n "ms: " 1>&2 - echo "$@" 1>&2 + echo -n "ms: " >&2 + echo "$@" >&2 } loge() { - echo "$@" 1>&2 + echo "$@" >&2 } # cut out all comments(#) and blank lines from standard input meat() { - grep -v -e "^[[:space:]]*#" -e '^$' + grep -v -e "^[[:space:]]*#" -e '^$' "$1" } # cut a specified line from standard input cutline() { - head --line="$1" | tail -1 + head --line="$1" "$2" | tail -1 } # check that characters are in a string (in an AND fashion). @@ -80,8 +83,13 @@ remove_line() { file="$1" string="$2" + # if the line is there are removed, return 0 if [ "$file" -a "$string" ] ; then grep -v "$string" "$file" | sponge "$file" + return 0 + # otherwise return 1 + else + return 1 fi } @@ -96,22 +104,21 @@ translate_ssh_variables() { # get the user's home directory userHome=$(getent passwd "$uname" | cut -d: -f6) - # translate ssh-style path variables + # translate '%u' to user name path=${path/\%u/"$uname"} + # translate '%h' to user home directory path=${path/\%h/"$userHome"} echo "$path" } -### CONVERTION UTILITIES +### CONVERSION UTILITIES # output the ssh key for a given key ID gpg2ssh() { local keyID - #keyID="$1" #TMP - # only use last 16 characters until openpgp2ssh can take all 40 #TMP - keyID=$(echo "$1" | cut -c 25-) #TMP + keyID="$1" gpg --export "$keyID" | openpgp2ssh "$keyID" 2> /dev/null } @@ -181,6 +188,11 @@ gpg2authorized_keys() { # (not just first N (5 in this case)) gpg_fetch_userid() { local userID + local returnCode + + if [ "$CHECK_KEYSERVER" != 'true' ] ; then + return 0 + fi userID="$1" @@ -189,18 +201,16 @@ gpg_fetch_userid() { gpg --quiet --batch --with-colons \ --command-fd 0 --keyserver "$KEYSERVER" \ --search ="$userID" > /dev/null 2>&1 + returnCode="$?" loge "done." -} - -# get the full fingerprint of a key ID -get_key_fingerprint() { - local keyID - keyID="$1" + # 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 - gpg --list-key --with-colons --fixed-list-mode \ - --with-fingerprint "$keyID" | grep "$keyID" | \ - grep '^fpr:' | cut -d: -f10 + return "$returnCode" } ######################################################################## @@ -246,17 +256,14 @@ process_user_id() { fi requiredPubCapability=$(echo "$requiredCapability" | tr "[:lower:]" "[:upper:]") - # if CHECK_KEYSERVER variable set, check the keyserver - # for the user ID - if [ "$CHECK_KEYSERVER" = "true" ] ; then - gpg_fetch_userid "$userID" - fi - # output gpg info for (exact) userid and store gpgOut=$(gpg --list-key --fixed-list-mode --with-colon \ --with-fingerprint --with-fingerprint \ ="$userID" 2>/dev/null) + # fetch the user ID if necessary/requested + gpg_fetch_userid "$userID" + # if the gpg query return code is not 0, return 1 if [ "$?" -ne 0 ] ; then log " - key not found." @@ -325,9 +332,9 @@ process_user_id() { # 0 = ok, 1 = bad if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then log " * acceptable key found." - echo 0 "$fingerprint" + echo "0:${fingerprint}" else - echo 1 "$fingerprint" + echo "1:${fingerprint}" fi ;; 'sub') # sub keys @@ -360,33 +367,40 @@ process_user_id() { # 0 = ok, 1 = bad if [ "$keyOK" -a "$uidOK" -a "$lastKeyOK" ] ; then log " * acceptable key found." - echo 0 "$fingerprint" + echo "0:${fingerprint}" else - echo 1 "$fingerprint" + echo "1:${fingerprint}" fi ;; esac done } -# process a host in known_host file +# process a single host in the known_host file process_host_known_hosts() { local host local userID local ok local keyid + local idOK + local idRemoved local tmpfile host="$1" - userID="ssh://${host}" log "processing host: $host" - process_user_id "ssh://${host}" | \ - while read -r ok keyid ; do + userID="ssh://${host}" + + for line in $(process_user_id "ssh://${host}") ; do + ok=$(echo "$line" | cut -d: -f1) + keyid=$(echo "$line" | cut -d: -f2) + sshKey=$(gpg2ssh "$keyid") - # remove the old host key line - remove_line "$KNOWN_HOSTS" "$sshKey" + + # remove the old host key line, and note if removed + remove_line "$KNOWN_HOSTS" "$sshKey" && idRemoved=true + # if key OK, add new host line if [ "$ok" -eq '0' ] ; then # hash if specified @@ -401,61 +415,219 @@ process_host_known_hosts() { else ssh2known_hosts "$host" "$sshKey" >> "$KNOWN_HOSTS" fi + + # note that at least one ok id was found + idOK=true fi done + + # if at least one ok id was found, return 0 + if [ "$idOK" ] ; then + return 0 + + # if ids were only removed, return 2 + elif [ "$idRemoved" ] ; then + return 2 + + # else return 1, to indicate nothing happened + else + return 1 + fi +} + +# update the known_hosts file for a set of hosts listed on command +# line +update_known_hosts() { + local nHosts + local host + local nHostsOK + local nHostsBAD + + # 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" + + 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 [ "$nHostsOK" -gt 0 -o "$nHostsBAD" -gt 0 ] ; then + log "known_hosts file updated." + fi + + # if all hosts were OK, return 0 + if [ "$nHostsOK" -eq "$nHosts" ] ; then + return 0 + + # if all hosts were BAD, return 2 + elif [ "$nHostsBAD" -eq "$nHosts" ] ; then + return 2 + + # else return 1 + else + return 1 + fi } -# process a uid in an authorized_keys file +# 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' ' ') + + # 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 ok local keyid + local idOK + local idRemoved userID="$1" log "processing user ID: $userID" - process_user_id "$userID" | \ - while read -r ok keyid ; do + for line in $(process_user_id "$userID") ; do + ok=$(echo "$line" | cut -d: -f1) + keyid=$(echo "$line" | cut -d: -f2) + sshKey=$(gpg2ssh "$keyid") + # remove the old host key line - remove_line "$AUTHORIZED_KEYS" "$sshKey" + remove_line "$AUTHORIZED_KEYS" "$sshKey" && idRemoved=true + # if key OK, add new host line if [ "$ok" -eq '0' ] ; then ssh2authorized_keys "$userID" "$sshKey" >> "$AUTHORIZED_KEYS" + + # note that at least one ok id was found + idOK=true fi done + + # if at least one ok id was found, return 0 + if [ "$idOK" ] ; then + return 0 + + # if ids were only removed, return 2 + elif [ "$idRemoved" ] ; then + return 2 + + # else return 1, to indicate nothing happened + else + return 1 + fi } -# process known_hosts file -# go through line-by-line, extract each host, and process with the -# host processing function -process_known_hosts() { - local hosts - local host +# 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 + + # 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" + + 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 - # take all the hosts from the known_hosts file (first field), - # grep out all the hashed hosts (lines starting with '|')... - cat "$KNOWN_HOSTS" | meat | \ - cut -d ' ' -f 1 | grep -v '^|.*$' | \ - while IFS=, read -r -a hosts ; do - # and process each host - for host in ${hosts[*]} ; do - process_host_known_hosts "$host" - done + # 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 [ "$nIDsOK" -gt 0 -o "$nIDsBAD" -gt 0 ] ; then + log "authorized_keys file updated." + fi + + # if all ids were OK, return 0 + if [ "$nIDsOK" -eq "$nIDs" ] ; then + return 0 + + # if all ids were BAD, return 2 + elif [ "$nIDsBAD" -eq "$nIDs" ] ; then + return 2 + + # else return 1 + else + return 1 + fi } # process an authorized_user_ids file for authorized_keys process_authorized_user_ids() { - local userid + local line + local userIDs authorizedUserIDs="$1" - cat "$authorizedUserIDs" | meat | \ - while read -r userid ; do - process_uid_authorized_keys "$userid" + log "processing authorized_user_ids file..." + + # extract user IDs from authorized_user_ids file + for line in $(seq 1 $(meat "$authorizedUserIDs" | wc -l)) ; do + userIDs[$((line-1))]=$(cutline "$line" "$authorizedUserIDs") done + + update_authorized_keys "${userIDs[@]}" } # EXPERIMENTAL (unused) process userids found in authorized_keys file @@ -465,13 +637,18 @@ process_authorized_user_ids() { process_authorized_keys() { local authorizedKeys local userID + local returnCode + + # default return code is 0, and is set to 1 if a key for a user + # is not found + returnCode=0 authorizedKeys="$1" # take all the monkeysphere userids from the authorized_keys file # comment field (third field) that starts with "MonkeySphere uid:" # FIXME: needs to handle authorized_keys options (field 0) - cat "$authorizedKeys" | meat | \ + meat "$authorizedKeys" | \ while read -r options keytype key comment ; do # if the comment field is empty, assume the third field was # the comment @@ -489,52 +666,8 @@ process_authorized_keys() { # process the userid log "processing userid: '$userID'" - process_user_id "$userID" > /dev/null + process_user_id "$userID" > /dev/null || returnCode=1 done -} - -################################################## -### GPG HELPER FUNCTIONS - -# retrieve key from web of trust, and set owner trust to "full" -# if key is found. -trust_key() { - # get the key from the key server - if ! gpg --keyserver "$KEYSERVER" --recv-key "$keyID" ; then - log "could not retrieve key '$keyID'" - return 1 - fi - - # get key fingerprint - fingerprint=$(get_key_fingerprint "$keyID") - - # attach a "non-exportable" signature to the key - # this is required for the key to have any validity at all - # the 'y's on stdin indicates "yes, i really want to sign" - echo -e 'y\ny' | gpg --lsign-key --command-fd 0 "$fingerprint" - - # import "full" trust for fingerprint into gpg - echo ${fingerprint}:5: | gpg --import-ownertrust - if [ $? = 0 ] ; then - log "owner trust updated." - else - failure "there was a problem changing owner trust." - fi -} - -# publish server key to keyserver -publish_server_key() { - read -p "really publish key to $KEYSERVER? [y|N]: " OK; OK=${OK:=N} - if [ ${OK/y/Y} != 'Y' ] ; then - failure "aborting." - fi - # publish host key - # FIXME: need to figure out better way to identify host key - # dummy command so as not to publish fakes keys during testing - # eventually: - #gpg --keyserver "$KEYSERVER" --send-keys $(hostname -f) - echo "NOT PUBLISHED (to avoid permanent publication errors during monkeysphere development). -To publish manually, do: gpg --keyserver $KEYSERVER --send-keys $(hostname -f)" - return 1 + return "$returnCode" }