X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=src%2Fmonkeysphere-server;h=a08007627a323c4ce4c8ae1d0feb204728b61fe0;hb=e6d14b3efaa96cc55eae34556daf8f85f09b92f6;hp=11e593b347c567b926e231159c4dacb2e3da7277;hpb=438d1fa8881a1f8359b5e91932bf42addefbffca;p=monkeysphere.git

diff --git a/src/monkeysphere-server b/src/monkeysphere-server
index 11e593b..a080076 100755
--- a/src/monkeysphere-server
+++ b/src/monkeysphere-server
@@ -11,9 +11,12 @@
 ########################################################################
 PGRM=$(basename $0)
 
-SHAREDIR=${SHAREDIR:-"/usr/share/monkeysphere"}
-export SHAREDIR
-. "${SHAREDIR}/common"
+SHARE=${SHARE:-"/usr/share/monkeysphere"}
+export SHARE
+. "${SHARE}/common" || exit 1
+
+VARLIB="/var/lib/monkeysphere"
+export VARLIB
 
 # date in UTF format if needed
 DATE=$(date -u '+%FT%T')
@@ -21,7 +24,7 @@ DATE=$(date -u '+%FT%T')
 # unset some environment variables that could screw things up
 GREP_OPTIONS=
 
-# assuming other problems don't crop up, we'll return 0 as success
+# default return code
 ERR=0
 
 ########################################################################
@@ -34,25 +37,173 @@ usage: $PGRM <subcommand> [args]
 MonkeySphere server admin tool.
 
 subcommands:
-  update-users (s) [USER]...            update users authorized_keys files
+  update-users (u) [USER]...            update users authorized_keys files
   gen-key (g) [HOSTNAME]                generate gpg key for the server
   show-fingerprint (f)                  show server's host key fingerprint
   publish-key (p)                       publish server's host key to keyserver
-  trust-key (t) KEYID [LEVEL]           set owner trust for keyid
+  add-certifier (a) KEYID               import and tsign a certification key
+  remove-certifier (r) KEYID            remove a certification key
+  list-certifiers (l)                   list certification keys
   help (h,?)                            this help
 
 EOF
 }
 
+su_monkeysphere_user() {
+    su --preserve-environment "$MONKEYSPHERE_USER" -- -c "$@"
+}
+
+# function to interact with the host gnupg keyring
+gpg_host() {
+    local returnCode
+
+    GNUPGHOME="$GNUPGHOME_HOST"
+    export GNUPGHOME
+
+    # NOTE: we supress this warning because we need the monkeysphere
+    # user to be able to read the host pubring.  we realize this might
+    # be problematic, but it's the simplest solution, without too much
+    # loss of security.
+    gpg --no-permission-warning "$@"
+    returnCode="$?"
+
+    # always reset the permissions on the host pubring so that the
+    # monkeysphere user can read the trust signatures
+    chgrp "$MONKEYSPHERE_USER" "${GNUPGHOME_HOST}/pubring.gpg"
+    chmod g+r "${GNUPGHOME_HOST}/pubring.gpg"
+    
+    return "$returnCode"
+}
+
+# function to interact with the authentication gnupg keyring
+gpg_authentication() {
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+    export GNUPGHOME
+
+    su_monkeysphere_user "gpg $@"
+}
+
+# update authorized_keys for users
+update_users() {
+    if [ "$1" ] ; then
+	# get users from command line
+	unames="$@"
+    else
+	# or just look at all users if none specified
+	unames=$(getent passwd | cut -d: -f1)
+    fi
+
+    # set mode
+    MODE="authorized_keys"
+
+    # set gnupg home
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+
+    # check to see if the gpg trust database has been initialized
+    if [ ! -s "${GNUPGHOME}/trustdb.gpg" ] ; then
+	failure "GNUPG trust database uninitialized.  Please see MONKEYSPHERE-SERVER(8)."
+    fi
+
+    # make sure the authorized_keys directory exists
+    mkdir -p "${VARLIB}/authorized_keys"
+
+    # loop over users
+    for uname in $unames ; do
+	# check all specified users exist
+	if ! getent passwd "$uname" >/dev/null ; then
+	    error "----- unknown user '$uname' -----"
+	    continue
+	fi
+
+	# set authorized_user_ids and raw authorized_keys variables,
+	# translating ssh-style path variables
+	authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
+	rawAuthorizedKeys=$(translate_ssh_variables "$uname" "$RAW_AUTHORIZED_KEYS")
+
+	# if neither is found, skip user
+	if [ ! -s "$authorizedUserIDs" ] ; then
+	    if [ "$rawAuthorizedKeys" = '-' -o ! -s "$rawAuthorizedKeys" ] ; then
+		continue
+	    fi
+	fi
+
+	log "----- user: $uname -----"
+
+        # make temporary directory
+        TMPDIR=$(mktemp -d)
+
+	# trap to delete temporary directory on exit
+	trap "rm -rf $TMPDIR" EXIT
+
+        # create temporary authorized_user_ids file
+        TMP_AUTHORIZED_USER_IDS="${TMPDIR}/authorized_user_ids"
+        touch "$TMP_AUTHORIZED_USER_IDS"
+
+        # create temporary authorized_keys file
+        AUTHORIZED_KEYS="${TMPDIR}/authorized_keys"
+        touch "$AUTHORIZED_KEYS"
+
+        # set restrictive permissions on the temporary files
+	# FIXME: is there a better way to do this?
+        chmod 0700 "$TMPDIR"
+        chmod 0600 "$AUTHORIZED_KEYS"
+        chmod 0600 "$TMP_AUTHORIZED_USER_IDS"
+        chown -R "$MONKEYSPHERE_USER" "$TMPDIR"
+
+	# if the authorized_user_ids file exists...
+	if [ -s "$authorizedUserIDs" ] ; then
+            # copy user authorized_user_ids file to temporary
+            # location
+	    cat "$authorizedUserIDs" > "$TMP_AUTHORIZED_USER_IDS"
+
+	    # export needed variables
+	    export AUTHORIZED_KEYS
+	    export TMP_AUTHORIZED_USER_IDS
+
+	    # process authorized_user_ids file, as monkeysphere
+	    # user
+	    su_monkeysphere_user \
+		". ${SHARE}/common; process_authorized_user_ids $TMP_AUTHORIZED_USER_IDS"
+	    ERR="$?"
+	fi
+
+	# add user-controlled authorized_keys file path if specified
+	if [ "$rawAuthorizedKeys" != '-' -a -s "$rawAuthorizedKeys" ] ; then
+	    log -n "adding raw authorized_keys file... "
+	    cat "$rawAuthorizedKeys" >> "$AUTHORIZED_KEYS"
+	    loge "done."
+	fi
+
+	# openssh appears to check the contents of the
+        # authorized_keys file as the user in question, so the
+        # file must be readable by that user at least.
+	# FIXME: is there a better way to do this?
+	chown root "$AUTHORIZED_KEYS"
+	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
+	mv -f "$AUTHORIZED_KEYS" "${VARLIB}/authorized_keys/${uname}"
+
+	# destroy temporary directory
+	rm -rf "$TMPDIR"
+    done
+}
+
 # generate server gpg key
 gen_key() {
     local hostName
+    local userID
+    local keyParameters
+    local fingerprint
 
     hostName=${1:-$(hostname --fqdn)}
-    service=${SERVICE:-"ssh"}
-    userID="${service}://${hostName}"
 
-    if gpg --list-key ="$userID" > /dev/null 2>&1 ; then
+    SERVICE=${SERVICE:-"ssh"}
+    userID="${SERVICE}://${hostName}"
+
+    if gpg_host --list-key ="$userID" > /dev/null 2>&1 ; then
 	failure "Key for '$userID' already exists"
     fi
 
@@ -81,7 +232,7 @@ Expire-Date: $KEY_EXPIRE
 EOF
 )
 
-    # add the revoker field if requested
+    # add the revoker field if specified
     # FIXME: the "1:" below assumes that $REVOKER's key is an RSA key.  why?
     # FIXME: why is this marked "sensitive"?  how will this signature ever
     # be transmitted to the expected revoker?
@@ -93,10 +244,10 @@ EOF
 )
     fi
 
-    echo "The following key parameters will be used:"
+    echo "The following key parameters will be used for the host private key:"
     echo "$keyParameters"
 
-    read -p "Generate key? [Y|n]: " OK; OK=${OK:=Y}
+    read -p "Generate key? (Y/n) " OK; OK=${OK:=Y}
     if [ ${OK/y/Y} != 'Y' ] ; then
 	failure "aborting."
     fi
@@ -109,33 +260,121 @@ EOF
 EOF
 )
 
-    log "generating server key... "
-    echo "$keyParameters" | gpg --batch --gen-key
+    log "generating server key..."
+    echo "$keyParameters" | gpg_host --batch --gen-key
 
     # output the server fingerprint
     fingerprint_server_key "=${userID}"
 
     # find the key fingerprint of the server primary key
-    keyID=$(gpg --list-key --with-colons --with-fingerprint "=${userID}" | \
+    fingerprint=$(gpg_host --list-key --with-colons --with-fingerprint "=${userID}" | \
 	grep '^fpr:' | head -1 | cut -d: -f10)
 
-    # write the key to the file
+    # translate the private key to ssh format, and export to a file
+    # for sshs usage.
     # NOTE: assumes that the primary key is the proper key to use
-    (umask 077 && gpgsecret2ssh "$keyID" > "${MS_HOME}/ssh_host_rsa_key")
-    log "Private SSH host key output to file: ${MS_HOME}/ssh_host_rsa_key"
+    (umask 077 && \
+	gpg_host --export-secret-key "$fingerprint" | \
+	openpgp2ssh "$fingerprint" > "${VARLIB}/ssh_host_rsa_key")
+    log "Private SSH host key output to file: ${VARLIB}/ssh_host_rsa_key"
 }
 
 # gpg output key fingerprint
 fingerprint_server_key() {
-    local ID
+    gpg_host --fingerprint --list-secret-keys
+}
 
-    if [ -z "$1" ] ; then
-	ID="$1"
-    else
-	ID="=ssh://$(hostname --fqdn)"
+# 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_authentication "--keyring $GNUPGHOME_HOST/pubring.gpg --keyserver $KEYSERVER --send-keys $(hostname -f)"
+    failure "NOT PUBLISHED (to avoid permanent publication errors during monkeysphere development)."
+}
+
+# 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 keyID
+    local fingerprint
+    local ltsignCommand
+
+    keyID="$1"
+    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 $keyID"
+
+    # get the full fingerprint of a key ID
+    fingerprint=$(gpg_authentication "--list-key --with-colons --with-fingerprint $keyID" | \
+	grep '^fpr:' | grep "$keyID" | cut -d: -f10)
+
+    if [ -z "$fingerprint" ] ; then
+	failure "Could not find key '$keyID'."
+    fi
+
+    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}
+    if [ "${OK/y/Y}" != 'Y' ] ; then
+	failure "aborting."
     fi
 
-    gpg --fingerprint --list-secret-keys "$ID"
+    # export the key to the host keyring
+    gpg_authentication "--export $keyID" | gpg_host --import
+
+    # default values for trust depth and domain
+    DEPTH=${DEPTH:-1}
+    DOMAIN=${DOMAIN:-}
+
+    # ltsign command
+    # NOTE: *all* user IDs will be ltsigned
+    ltsignCommand=$(cat <<EOF
+ltsign
+y
+2
+$DEPTH
+$DOMAIN
+y
+save
+EOF
+)
+
+    # ltsign the key
+    echo "$ltsignCommand" | gpg_host --quiet --command-fd 0 --edit-key "$fingerprint"
+
+    # update the trustdb for the authentication keyring
+    gpg_authentication "--check-trustdb"
+}
+
+# delete a certifiers key from the host keyring
+remove_certifier() {
+    local keyID
+    local fingerprint
+
+    keyID="$1"
+
+    # delete the requested key (with prompting)
+    gpg_host --delete-key "$keyID"
+
+    # update the trustdb for the authentication keyring
+    gpg_authentication "--check-trustdb"
+}
+
+# list the host certifiers
+list_certifiers() {
+    gpg_host --list-keys
 }
 
 ########################################################################
@@ -146,112 +385,66 @@ COMMAND="$1"
 [ "$COMMAND" ] || failure "Type '$PGRM help' for usage."
 shift
 
-# set ms home directory
-MS_HOME=${MS_HOME:-"$ETC"}
-
 # load configuration file
-MS_CONF=${MS_CONF:-"$MS_HOME"/monkeysphere-server.conf}
+MS_CONF=${MS_CONF:-"${ETC}/monkeysphere-server.conf"}
 [ -e "$MS_CONF" ] && . "$MS_CONF"
 
 # set empty config variable with defaults
-GNUPGHOME=${GNUPGHOME:-"${MS_HOME}/gnupg"}
+MONKEYSPHERE_USER=${MONKEYSPHERE_USER:-"monkeysphere"}
 KEYSERVER=${KEYSERVER:-"subkeys.pgp.net"}
 CHECK_KEYSERVER=${CHECK_KEYSERVER:="true"}
-REQUIRED_USER_KEY_CAPABILITY=${REQUIRED_USER_KEY_CAPABILITY:-"a"}
 AUTHORIZED_USER_IDS=${AUTHORIZED_USER_IDS:-"%h/.config/monkeysphere/authorized_user_ids"}
-USER_CONTROLLED_AUTHORIZED_KEYS=${USER_CONTROLLED_AUTHORIZED_KEYS:-"%h/.ssh/authorized_keys"}
+RAW_AUTHORIZED_KEYS=${RAW_AUTHORIZED_KEYS:-"%h/.ssh/authorized_keys"}
 
+# other variables
+REQUIRED_USER_KEY_CAPABILITY=${REQUIRED_USER_KEY_CAPABILITY:-"a"}
+GNUPGHOME_HOST=${GNUPGHOME_HOST:-"${VARLIB}/gnupg-host"}
+GNUPGHOME_AUTHENTICATION=${GNUPGHOME_AUTHENTICATION:-"${VARLIB}/gnupg-authentication"}
+
+# export variables
+export DATE
+export MODE
+export MONKEYSPHERE_USER
+export KEYSERVER
+export CHECK_KEYSERVER
+export REQUIRED_USER_KEY_CAPABILITY
+export GNUPGHOME_HOST
+export GNUPGHOME_AUTHENTICATION
 export GNUPGHOME
 
-# make sure the monkeysphere home directory exists
-mkdir -p "${MS_HOME}/authorized_user_ids"
-# make sure gpg home exists with proper permissions
-mkdir -p -m 0700 "$GNUPGHOME"
-# make sure the authorized_keys directory exists
-mkdir -p "${CACHE}/authorized_keys"
-
 case $COMMAND in
     'update-users'|'update-user'|'u')
-	if [ "$1" ] ; then
-	    # get users from command line
-	    unames="$@"
-	else
-	    # or just look at all users if none specified
-	    unames=$(getent passwd | cut -d: -f1)
-	fi
-
-	# loop over users
-	for uname in $unames ; do
-	    MODE="authorized_keys"
-
-	    # check all specified users exist
-	    if ! getent passwd "$uname" >/dev/null ; then
-		error "----- unknown user '$uname' -----"
-		continue
-	    fi
-
-	    # set authorized_user_ids variable,
-	    # translate ssh-style path variables
-	    authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
-
-	    # skip user if authorized_user_ids file does not exist
-	    if [ ! -f "$authorizedUserIDs" ] ; then
-		#FIXME: what about a user with no authorized_user_ids
-		# file, but with an authorized_keys file when
-		# USER_CONTROLLED_AUTHORIZED_KEYS is set?
-		continue
-	    fi
-
-	    log "----- user: $uname -----"
-
-	    # temporary authorized_keys file
-	    AUTHORIZED_KEYS=$(mktemp)
-
-	    # skip if the user's authorized_user_ids file is empty
-	    if [ ! -s "$authorizedUserIDs" ] ; then
-		log "authorized_user_ids file '$authorizedUserIDs' is empty."
-		#FIXME: what about a user with an empty
-		# authorized_user_ids file, but with an
-		# authorized_keys file when
-		# USER_CONTROLLED_AUTHORIZED_KEYS is set?
-		continue
-	    fi
-
-	    # process authorized_user_ids file
-	    log "processing authorized_user_ids file..."
-	    process_authorized_user_ids "$authorizedUserIDs"
-
-	    # add user-controlled authorized_keys file path if specified
-	    if [ "$USER_CONTROLLED_AUTHORIZED_KEYS" != '-' ] ; then
-		userAuthorizedKeys=$(translate_ssh_variables "$uname" "$USER_CONTROLLED_AUTHORIZED_KEYS")
-		if [ -f "$userAuthorizedKeys" ] ; then
-		    log -n "adding user's authorized_keys file... "
-		    cat "$userAuthorizedKeys" >> "$AUTHORIZED_KEYS"
-		    loge "done."
-		fi
-	    fi
-
-	    # move the temp authorized_keys file into place
-	    mv -f "$AUTHORIZED_KEYS" "${CACHE}/authorized_keys/${uname}"
-
-	    log "authorized_keys file updated."
-	done
+	update_users "$@"
 	;;
 
     'gen-key'|'g')
-	gen_key "$1"
+	gen_key "$@"
 	;;
 
     'show-fingerprint'|'f')
-	fingerprint_server_key "$@"
+	fingerprint_server_key
 	;;
 
     'publish-key'|'p')
 	publish_server_key
 	;;
 
-    'trust-key'|'trust-key'|'t')
-	trust_key "$@"
+    'add-certifier'|'a')
+	if [ -z "$1" ] ; then
+	    failure "You must specify a key ID."
+	fi
+	add_certifier "$1"
+	;;
+
+    'remove-certifier'|'r')
+	if [ -z "$1" ] ; then
+	    failure "You must specify a key ID."
+	fi
+	remove_certifier "$1"
+	;;
+
+    'list-certifiers'|'l')
+	list_certifiers "$@"
 	;;
 
     'help'|'h'|'?')