X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=src%2Fmonkeysphere-server;h=3ca0656e4ad5168b48a6282c4174a25f301168ce;hb=4d54f1d8b9a3d9ee4e6bd0b0d9fdccb99e6a6245;hp=a5497c29e06a36b94e827a9407dc8a4095d35184;hpb=13298a58b39438ae9892194578b8b8f3d3b6013a;p=monkeysphere.git diff --git a/src/monkeysphere-server b/src/monkeysphere-server index a5497c2..3ca0656 100755 --- a/src/monkeysphere-server +++ b/src/monkeysphere-server @@ -32,29 +32,31 @@ RETURN=0 ######################################################################## usage() { -cat < [options] [args] MonkeySphere server admin tool. subcommands: - update-users (u) [USER]... update users authorized_keys files - - gen-key (g) [HOSTNAME] generate gpg key for the server - -l|--length BITS key length in bits (2048) - -e|--expire EXPIRE date to expire - -r|--revoker FINGERPRINT add a revoker - show-fingerprint (f) show server's host key fingerprint - publish-key (p) publish server's host key to keyserver - - add-identity-certifier (a) KEYID import and tsign a certification key - -n|--domain DOMAIN domain of certifier () - -t|--trust TRUST trust level of certifier ('full') - -d|--depth DEPTH trust depth for certifier (1) - remove-identity-certifier (r) KEYID remove a certification key - list-identity-certifiers (l) list certification keys - - help (h,?) this help - + update-users (u) [USER]... update user authorized_keys files + + gen-key (g) [HOSTNAME] generate gpg key for the server + -l|--length BITS key length in bits (2048) + -e|--expire EXPIRE date to expire + -r|--revoker FINGERPRINT add a revoker + show-fingerprint (f) show server's host key fingerprint + publish-key (p) publish server's host key to keyserver + diagnostics (d) report on the server's monkeysphere status + + add-identity-certifier (a) KEYID import and tsign a certification key + -n|--domain DOMAIN limit ID certifications to IDs in DOMAIN + -t|--trust TRUST trust level of certifier (full) + -d|--depth DEPTH trust depth for certifier (1) + remove-identity-certifier (r) KEYID remove a certification key + list-identity-certifiers (l) list certification keys + + gpg-authentication-cmd CMD gnupg-authentication command + + -h|--help|help (h,?) this help EOF } @@ -141,13 +143,15 @@ update_users() { log "----- user: $uname -----" + # exit if the authorized_user_ids file is empty if ! check_key_file_permissions "$uname" "$AUTHORIZED_USER_IDS" ; then - log "Improper permissions on authorized_user_ids file." + log "Improper permissions on authorized_user_ids file path." continue fi + # check permissions on the authorized_keys file path if ! check_key_file_permissions "$uname" "$RAW_AUTHORIZED_KEYS" ; then - log "Improper permissions on authorized_keys file." + log "Improper permissions on authorized_keys file path path." continue fi @@ -204,8 +208,7 @@ update_users() { chgrp $(getent passwd "$uname" | cut -f4 -d:) "$AUTHORIZED_KEYS" chmod g+r "$AUTHORIZED_KEYS" - # if the resulting authorized_keys file is not empty, move - # it into place + # move the resulting authorized_keys file into place mv -f "$AUTHORIZED_KEYS" "${VARLIB}/authorized_keys/${uname}" # destroy temporary directory @@ -215,11 +218,56 @@ update_users() { # generate server gpg key gen_key() { + local keyType + local keyLength + local keyUsage + local keyExpire + local revoker local hostName local userID local keyParameters local fingerprint + # set default key parameter values + keyType="RSA" + keyLength="2048" + keyUsage="auth" + keyExpire= + revoker= + + # get options + TEMP=$(getopt -o e:l:r -l expire:,length:,revoker: -n "$PGRM" -- "$@") + + if [ $? != 0 ] ; then + exit 1 + fi + + # Note the quotes around `$TEMP': they are essential! + eval set -- "$TEMP" + + while true ; do + case "$1" in + -l|--length) + keyLength="$2" + shift 2 + ;; + -e|--expire) + keyExpire="$2" + shift 2 + ;; + -r|--revoker) + revoker="$2" + shift 2 + ;; + --) + shift + ;; + *) + break + ;; + esac + done + hostName=${1:-$(hostname --fqdn)} userID="ssh://${hostName}" @@ -228,12 +276,8 @@ gen_key() { failure "Key for '$userID' already exists" fi - # set key variables - KEY_TYPE="RSA" - KEY_LENGTH=${KEY_LENGTH:="2048"} - KEY_USAGE="auth" # prompt about key expiration if not specified - if [ -z "$KEY_EXPIRE" ] ; then + if [ -z "$keyExpire" ] ; then cat <m = key expires in n months y = key expires in n years EOF - while [ -z "$KEY_EXPIRE" ] ; do - read -p "Key is valid for? (0) " KEY_EXPIRE - if ! test_gpg_expire ${KEY_EXPIRE:=0} ; then + while [ -z "$keyExpire" ] ; do + read -p "Key is valid for? (0) " keyExpire + if ! test_gpg_expire ${keyExpire:=0} ; then echo "invalid value" - unset KEY_EXPIRE + unset keyExpire fi done - elif ! test_gpg_expire "$KEY_EXPIRE" ; then - failure "invalid key expiration value '$KEY_EXPIRE'." + elif ! test_gpg_expire "$keyExpire" ; then + failure "invalid key expiration value '$keyExpire'." fi # set key parameters keyParameters=$(cat < 1 )); then + echo "! More than one host key found?" + # FIXME: recommend a way to resolve this + else + create=$(echo "$seckey" | grep ^sec: | cut -f6 -d:) + expire=$(echo "$seckey" | grep ^sec: | cut -f7 -d:) + fingerprint=$(echo "$seckey" | grep ^fpr: | head -n1 | cut -f10 -d:) + # check for key expiration: + if [ "$expire" ]; then + if (( "$expire" < "$curdate" )); then + echo "! Host key is expired." + # FIXME: recommend a way to resolve this other than re-keying? + elif (( "$expire" < "$warndate" )); then + echo "! Host key expires in less than $warnwindow:" $(date -d "$(( $expire - $curdate )) seconds" +%F) + # FIXME: recommend a way to resolve this? + fi + fi + + # and weirdnesses: + if [ "$create" ] && (( "$create" > "$curdate" )); then + echo "! Host key was created in the future(?!). Is your clock correct?" + echo " - Recommendation: Check clock ($(date +%F_%T)); use NTP?" + fi + + # check for UserID expiration: + echo "$seckey" | grep ^uid: | cut -d: -f6,7,10 | \ + while IFS=: read create expire uid ; do + # FIXME: should we be doing any checking on the form + # of the User ID? Should we be unmangling it somehow? + + if [ "$create" ] && (( "$create" > "$curdate" )); then + echo "! User ID '$uid' was created in the future(?!). Is your clock correct?" + echo " - Recommendation: Check clock ($(date +%F_%T)); use NTP?" + fi + if [ "$expire" ] ; then + if (( "$expire" < "$curdate" )); then + echo "! User ID '$uid' is expired." + # FIXME: recommend a way to resolve this + elif (( "$expire" < "$warndate" )); then + echo "! User ID '$uid' expires in less than $warnwindow:" $(date -d "$(( $expire - $curdate )) seconds" +%F) + # FIXME: recommend a way to resolve this + fi + fi + done + +# FIXME: verify that the host key is properly published to the +# keyservers (do this with the non-privileged user) + +# FIXME: check that there are valid, non-expired certifying signatures +# attached to the host key after fetching from the public keyserver +# (do this with the non-privileged user as well) + +# FIXME: propose adding a revoker to the host key if none exist (do we +# have a way to do that after key generation?) + + # Ensure that the ssh_host_rsa_key file is present and non-empty: + echo "Checking host SSH key..." + if [ ! -s "${VARLIB}/ssh_host_rsa_key" ] ; then + echo "! The host key as prepared for SSH (${VARLIB}/ssh_host_rsa_key) is missing or empty." + else + if [ $(stat -c '%a' "${VARLIB}/ssh_host_rsa_key") != 600 ] ; then + echo "! Permissions seem wrong for ${VARLIB}/ssh_host_rsa_key -- should be 0600." + fi + + # propose changes needed for sshd_config (if any) + if ! grep -q "^HostKey[[:space:]]\+${VARLIB}/ssh_host_rsa_key$" /etc/ssh/sshd_config; then + echo "! /etc/ssh/sshd_config does not point to the monkeysphere host key (${VARLIB}/ssh_host_rsa_key)." + echo " - Recommendation: add a line to /etc/ssh/sshd_config: 'HostKey ${VARLIB}/ssh_host_rsa_key'" + fi + if badhostkeys=$(grep -i '^HostKey' | grep -q -v "^HostKey[[:space:]]\+${VARLIB}/ssh_host_rsa_key$") ; then + echo "! /etc/sshd_config refers to some non-monkeysphere host keys:" + echo "$badhostkeys" + echo " - Recommendation: remove the above HostKey lines from /etc/ssh/sshd_config" + fi + fi + fi + +# FIXME: look at the ownership/privileges of the various keyrings, +# directories housing them, etc (what should those values be? can +# we make them as minimal as possible?) + +# FIXME: look to see that the ownertrust rules are set properly on the +# authentication keyring + +# FIXME: make sure that at least one identity certifier exists + + echo "Checking for MonkeySphere-enabled public-key authentication for users ..." + # Ensure that User ID authentication is enabled: + if ! grep -q "^AuthorizedKeysFile[[:space:]]\+${VARLIB}/authorized_keys/%u$" /etc/ssh/sshd_config; then + echo "! /etc/ssh/sshd_config does not point to monkeysphere authorized keys." + echo " - Recommendation: add a line to /etc/ssh/sshd_config: 'AuthorizedKeysFile ${VARLIB}/authorized_keys/%u'" + fi + if badauthorizedkeys=$(grep -i '^AuthorizedKeysFile' | grep -q -v "^AuthorizedKeysFile[[:space:]]\+${VARLIB}/authorized_keys/%u$") ; then + echo "! /etc/sshd_config refers to non-monkeysphere authorized_keys files:" + echo "$badauthorizedkeys" + echo " - Recommendation: remove the above AuthorizedKeysFile lines from /etc/ssh/sshd_config" + fi + + } # retrieve key from web of trust, import it into the host keyring, and # ltsign the key in the host keyring so that it may certify other keys add_certifier() { + local domain + local trust + local depth local keyID local fingerprint local ltsignCommand + local trustval + + # set default values for trust depth and domain + domain= + trust=full + depth=1 + + # get options + TEMP=$(getopt -o n:t:d: -l domain:,trust:,depth: -n "$PGRM" -- "$@") + + if [ $? != 0 ] ; then + exit 1 + fi + + # Note the quotes around `$TEMP': they are essential! + eval set -- "$TEMP" + + while true ; do + case "$1" in + -n|--domain) + domain="$2" + shift 2 + ;; + -t|--trust) + trust="$2" + shift 2 + ;; + -d|--depth) + depth="$2" + shift 2 + ;; + --) + shift + ;; + *) + break + ;; + esac + done keyID="$1" + if [ -z "$keyID" ] ; then + failure "You must specify the key ID of a key to add." + fi export keyID - # export host ownertrust to authentication keyring - gpg_host --export-ownertrust | gpg_authentication "--import-ownertrust" - # get the key from the key server - gpg_authentication "--keyserver $KEYSERVER --recv-key '$keyID'" || failure + gpg_authentication "--keyserver $KEYSERVER --recv-key '$keyID'" # get the full fingerprint of a key ID fingerprint=$(gpg_authentication "--list-key --with-colons --with-fingerprint $keyID" | \ @@ -351,7 +569,8 @@ add_certifier() { echo "key found:" gpg_authentication "--fingerprint $fingerprint" - read -p "Are you sure you want to add this key as a certifier of users on this system? (y/N) " OK; OK=${OK:-N} + echo "Are you sure you want to add this key as a certifier of" + read -p "users on this system? (y/N) " OK; OK=${OK:-N} if [ "${OK/y/Y}" != 'Y' ] ; then failure "aborting." fi @@ -359,23 +578,26 @@ add_certifier() { # export the key to the host keyring gpg_authentication "--export $keyID" | gpg_host --import - # default values for trust depth and domain - DOMAIN=${DOMAIN:-} - TRUST=${TRUST:-2} - DEPTH=${DEPTH:-1} + if [ "$trust" == marginal ]; then + trustval=1 + elif [ "$trust" == full ]; then + trustval=2 + else + failure "trust value requested ('$trust') was unclear (only 'marginal' or 'full' are supported)" + fi # ltsign command # NOTE: *all* user IDs will be ltsigned ltsignCommand=$(cat <