X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=src%2Fmonkeysphere-server;h=4c403f2a2647ea4f074a8bad5637ad134190a97d;hb=1b6df37b94b96042ac460a933b00c6ef29694053;hp=cdb76eef5722c50acaae8bb4ffd79165dcea21cb;hpb=c32302172e3533b2170329206ff011d6e3a26a49;p=monkeysphere.git

diff --git a/src/monkeysphere-server b/src/monkeysphere-server
index cdb76ee..4c403f2 100755
--- a/src/monkeysphere-server
+++ b/src/monkeysphere-server
@@ -10,10 +10,14 @@
 
 ########################################################################
 PGRM=$(basename $0)
+PGRM_PATH=$(dirname $0)
 
-SHAREDIR=${SHAREDIR:-"/usr/share/monkeysphere"}
-export SHAREDIR
-. "${SHAREDIR}/common"
+SHARE=${SHARE:-"/usr/share/monkeysphere"}
+export SHARE
+. "${SHARE}/common"
+
+VARLIB="/var/lib/monkeysphere"
+export VARLIB
 
 # date in UTF format if needed
 DATE=$(date -u '+%FT%T')
@@ -21,6 +25,9 @@ DATE=$(date -u '+%FT%T')
 # unset some environment variables that could screw things up
 GREP_OPTIONS=
 
+# default return code
+ERR=0
+
 ########################################################################
 # FUNCTIONS
 ########################################################################
@@ -31,12 +38,11 @@ usage: $PGRM <subcommand> [args]
 MonkeySphere server admin tool.
 
 subcommands:
-  update-users (s) [USER]...            update users authorized_keys files
-  gen-key (g)                           generate gpg key for the server
-  publish-key (p)                       publish server key to keyserver
-  trust-keys (t) KEYID...               mark keyids as trusted
-  update-user-userids (u) USER UID...   add/update user IDs for a user
-  remove-user-userids (r) USER UID...   remove user IDs for a user
+  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
   help (h,?)                            this help
 
 EOF
@@ -44,25 +50,50 @@ EOF
 
 # generate server gpg key
 gen_key() {
+    local hostName
+    local userID
+    local keyParameters
+    local fingerprint
+
+    hostName=${1:-$(hostname --fqdn)}
+
+    SERVICE=${SERVICE:-"ssh"}
+    userID="${SERVICE}://${hostName}"
+
+    GNUPGHOME="$GNUPGHOME_HOST"
+    if gpg --list-key ="$userID" > /dev/null 2>&1 ; then
+	failure "Key for '$userID' already exists"
+    fi
+
     # set key defaults
     KEY_TYPE=${KEY_TYPE:-"RSA"}
     KEY_LENGTH=${KEY_LENGTH:-"2048"}
-    KEY_USAGE=${KEY_USAGE:-"auth,encrypt"}
-    SERVICE=${SERVICE:-"ssh"}
-    HOSTNAME_FQDN=${HOSTNAME_FQDN:-$(hostname -f)}
-
-    USERID=${USERID:-"$SERVICE"://"$HOSTNAME_FQDN"}
+    KEY_USAGE=${KEY_USAGE:-"auth"}
+    KEY_EXPIRE=${KEY_EXPIRE:-"0"}
+    cat <<EOF
+Please specify how long the key should be valid.
+         0 = key does not expire
+      <n>  = key expires in n days
+      <n>w = key expires in n weeks
+      <n>m = key expires in n months
+      <n>y = key expires in n years
+EOF
+    read -p "Key is valid for? ($KEY_EXPIRE) " KEY_EXPIRE; KEY_EXPIRE=${KEY_EXPIRE:-"0"}
 
     # set key parameters
     keyParameters=$(cat <<EOF
 Key-Type: $KEY_TYPE
 Key-Length: $KEY_LENGTH
 Key-Usage: $KEY_USAGE
-Name-Real: $USERID
+Name-Real: $userID
+Expire-Date: $KEY_EXPIRE
 EOF
 )
 
     # add the revoker field if requested
+    # FIXME: the "1:" below assumes that $REVOKER's key is an RSA key.  why?
+    # FIXME: why is this marked "sensitive"?  how will this signature ever
+    # be transmitted to the expected revoker?
     if [ "$REVOKER" ] ; then
 	keyParameters="${keyParameters}"$(cat <<EOF
 
@@ -74,15 +105,11 @@ EOF
     echo "The following key parameters will be used:"
     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
 
-    if gpg --list-key ="$USERID" > /dev/null 2>&1 ; then
-	failure "key for '$USERID' already exists"
-    fi
-
     # add commit command
     keyParameters="${keyParameters}"$(cat <<EOF
 
@@ -92,7 +119,152 @@ EOF
 )
 
     log "generating server key..."
+    GNUPGHOME="$GNUPGHOME_HOST"
     echo "$keyParameters" | gpg --batch --gen-key
+
+    # output the server fingerprint
+    fingerprint_server_key "=${userID}"
+
+    # find the key fingerprint of the server primary key
+    GNUPGHOME="$GNUPGHOME_HOST"
+    fingerprint=$(gpg --list-key --with-colons --with-fingerprint "=${userID}" | \
+	grep '^fpr:' | head -1 | cut -d: -f10)
+
+    # export the host key to the authentication keyring
+    GNUPGHOME="$GNUPGHOME_HOST" gpg --export "$fingerprint" | \
+	su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+	"GNUPGHOME=$GNUPGHOME_AUTHENTICATION gpg --import"
+
+    # set host key owner trust to ultimate in authentication keyring
+    echo "${fingerprint}:6:" | \
+        su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+        "GNUPGHOME=$GNUPGHOME_AUTHENTICATION gpg --import-ownertrust"
+
+    # write the key to the file
+    # NOTE: assumes that the primary key is the proper key to use
+    GNUPGHOME="$GNUPGHOME_HOST"
+    (umask 077 && gpgsecret2ssh "$fingerprint" > "${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
+
+    if [ "$1" ] ; then
+	ID="$1"
+    else
+	ID="=ssh://$(hostname --fqdn)"
+    fi
+
+    gpg --fingerprint --list-secret-keys "$ID"
+}
+
+# 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)
+    failure "NOT PUBLISHED (to avoid permanent publication errors during monkeysphere development).
+To publish manually, do: gpg --keyserver $KEYSERVER --send-keys $(hostname -f)"
+}
+
+
+# retrieve key from web of trust, and set owner trust to "full"
+# if key is found.
+trust_key() {
+    local keyID
+    local trustLevel
+
+    keyID="$1"
+    trustLevel="$2"
+
+    if [ -z "$keyID" ] ; then
+	failure "You must specify key to trust."
+    fi
+
+    export keyID
+
+    # get the key from the key server
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+    su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+	"gpg --keyserver $KEYSERVER --recv-key $keyID"
+    if [ "$?" != 0 ] ; then
+	failure "Could not retrieve key '$keyID'."
+    fi
+
+    # move the key from the authentication keyring to the host keyring
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+    su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+	"gpg --export $keyID" | \
+	GNUPGHOME="$GNUPGHOME_HOST" gpg --import
+
+    # get key fingerprint
+    GNUPGHOME="$GNUPGHOME_HOST"
+    fingerprint=$(get_key_fingerprint "$keyID")
+
+    echo "key found:"
+    GNUPGHOME="$GNUPGHOME_HOST"
+    gpg --fingerprint "$fingerprint"
+
+    while [ -z "$trustLevel" ] ; do
+	cat <<EOF
+Please decide how far you trust this user to correctly verify other users' keys
+(by looking at passports, checking fingerprints from different sources, etc.)
+
+  1 = I don't know or won't say
+  2 = I do NOT trust
+  3 = I trust marginally
+  4 = I trust fully
+  5 = I trust ultimately
+
+EOF
+	read -p "Your decision? " trustLevel
+	if echo "$trustLevel" | grep -v "[1-5]" ; then
+	    echo "Unknown trust level '$trustLevel'."
+	    unset trustLevel
+	elif [ "$trustLevel" = 'q' ] ; then
+	    failure "Aborting."
+	fi
+    done
+
+    # attach a "non-exportable" signature to the key
+    # this is required for the key to have any validity at all
+    # the 'y's on stdin indicates "yes, i really want to sign"
+    GNUPGHOME="$GNUPGHOME_HOST"
+    echo -e 'y\ny' | \
+	gpg --quiet --lsign-key --command-fd 0 "$fingerprint"
+
+    # copy the host keyring into the authentication keyring
+    mv "$GNUPGHOME_AUTHENTICATION"/pubring.gpg{,.old}
+    cp "$GNUPGHOME_HOST"/pubring.gpg "$GNUPGHOME_AUTHENTICATION"/pubring.gpg
+    chown "$MONKEYSPHERE_USER" "$GNUPGHOME_AUTHENTICATION"/pubring.gpg
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+    su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+	"gpg --import ${GNUPGHOME_AUTHENTICATION}/pubring.gpg.old"
+
+    # index trustLevel by one to difference between level in ui and level
+    # internally
+    trustLevel=$((trustLevel+1))
+
+    # import new owner trust level for key
+    GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+    echo "${fingerprint}:${trustLevel}:" | \
+        su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+        "GNUPGHOME=$GNUPGHOME_AUTHENTICATION gpg --import-ownertrust"
+
+    if [ $? = 0 ] ; then
+	log "Owner trust updated."
+    else
+	failure "There was a problem changing owner trust."
+    fi
 }
 
 ########################################################################
@@ -111,124 +283,156 @@ MS_CONF=${MS_CONF:-"$MS_HOME"/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"}
-REQUIRED_USER_KEY_CAPABILITY=${REQUIRED_USER_KEY_CAPABILITY:-"a"}
-USER_CONTROLLED_AUTHORIZED_KEYS=${USER_CONTROLLED_AUTHORIZED_KEYS:-"%h/.ssh/authorized_keys"}
+CHECK_KEYSERVER=${CHECK_KEYSERVER:="true"}
+AUTHORIZED_USER_IDS=${AUTHORIZED_USER_IDS:-"%h/.config/monkeysphere/authorized_user_ids"}
+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 MODE
+export MONKEYSPHERE_USER
+export KEYSERVER
+export CHECK_KEYSERVER
+export REQUIRED_USER_KEY_CAPABILITY
+export GNUPGHOME_HOST
+export GNUPGHOME_AUTHENTICATION
 export GNUPGHOME
 
-# make sure gpg home exists with proper permissions
-mkdir -p -m 0700 "$GNUPGHOME"
-
 case $COMMAND in
-    'update-users'|'update-user'|'s')
+    'update-users'|'update-user'|'u')
 	if [ "$1" ] ; then
+	    # get users from command line
 	    unames="$@"
 	else
-	    unames=$(ls -1 "$MS_HOME"/authorized_user_ids)
+	    # or just look at all users if none specified
+	    unames=$(getent passwd | cut -d: -f1)
 	fi
 
-	for uname in $unames ; do
-	    MODE="authorized_keys"
+	# set mode
+	MODE="authorized_keys"
 
-	    log "----- user: $uname -----"
+	# set gnupg home
+	GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
 
-	    # set variables for the user
-	    AUTHORIZED_USER_IDS="$MS_HOME"/authorized_user_ids/"$uname"
-	    msAuthorizedKeys="$CACHE"/"$uname"/authorized_keys
-	    cacheDir="$CACHE"/"$uname"/user_keys
+	# 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 user's authorized_user_ids file exists
-	    touch "$AUTHORIZED_USER_IDS"
+        # make sure the authorized_keys directory exists
+	mkdir -p "${VARLIB}/authorized_keys"
 
-	    # skip if the user's authorized_user_ids file is empty
-	    if [ ! -s "$AUTHORIZED_USER_IDS" ] ; then
-		log "authorized_user_ids file for '$uname' is empty."
+	# 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 user-controlled authorized_keys file path
-	    if [ "$USER_CONTROLLED_AUTHORIZED_KEYS" ] ; then
-		userHome=$(getent passwd "$uname" | cut -d: -f6)
-		userAuthorizedKeys=${USER_CONTROLLED_AUTHORIZED_KEYS/\%h/"$userHome"}
-	    fi
+	    # set authorized_user_ids and raw authorized_keys variables,
+	    # translating ssh-style path variables
+	    authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
+	    rawAuthorizedKeys=$(translate_ssh_variables "$uname" "$RAW_AUTHORIZED_KEYS")
 
-	    # update authorized_keys
-	    update_authorized_keys "$msAuthorizedKeys" "$userAuthorizedKeys" "$cacheDir"
-	done
-
-	log "----- done. -----"
-	;;
+	    # if neither is found, skip user
+	    if [ ! -s "$authorizedUserIDs" ] ; then
+		if [ "$rawAuthorizedKeys" = '-' -o ! -s "$rawAuthorizedKeys" ] ; then
+		    continue
+		fi
+	    fi
 
-    'gen-key'|'g')
-	gen_key
-	;;
+	    log "----- user: $uname -----"
 
-    'publish-key'|'p')
-	publish_server_key
-	;;
+            # 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" > "$TMP_AUTHORIZED_USER_IDS"
+
+		# export needed variables
+		export AUTHORIZED_KEYS
+		export TMP_AUTHORIZED_USER_IDS
+
+		# process authorized_user_ids file, as monkeysphere
+		# user
+		su --preserve-environment "$MONKEYSPHERE_USER" -c -- \
+		    ". ${SHARE}/common; process_authorized_user_ids $TMP_AUTHORIZED_USER_IDS"
+	    fi
 
-    'trust-keys'|'trust-key'|'t')
-	if [ -z "$1" ] ; then
-	    failure "You must specify at least one key to trust."
-	fi
+	    # add user-controlled authorized_keys file path if specified
+	    if [ "$rawAuthorizedKeys" != '-' -a -s "$rawAuthorizedKeys" ] ; then
+		log -n "adding raw authorized_keys file... "
+		cat "$rawAuthorizedKeys" >> "$AUTHORIZED_KEYS"
+		loge "done."
+	    fi
 
-	# process key IDs
-	for keyID ; do
-	    trust_key "$keyID"
+	    # openssh appears to check the contents of the
+            # authorized_keys file as the user in question, so the
+            # file must be readable by that user at least.
+	    # FIXME: is there a better way to do this?
+	    chown root "$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/${uname}"
+
+	    log "authorized_keys file updated."
+	    
+	    # destroy temporary directory
+	    rm -rf "$TMPDIR"
 	done
 	;;
 
-    'update-user-userids'|'update-user-userid'|'u')
-	uname="$1"
-	shift
-	if [ -z "$uname" ] ; then
-	    failure "You must specify user."
-	fi
-	if [ -z "$1" ] ; then
-	    failure "You must specify at least one user ID."
-	fi
-
-	# set variables for the user
-	AUTHORIZED_USER_IDS="$MS_HOME"/authorized_user_ids/"$uname"
-	cacheDir="$CACHE"/"$uname"/user_keys
-
-        # make sure user's authorized_user_ids file exists
-	touch "$AUTHORIZED_USER_IDS"
-
-	# process the user IDs
-	for userID ; do
-	    update_userid "$userID" "$cacheDir"
-	done
-
-	log "Run the following to update user's authorized_keys file:"
-	log "$PGRM update-users $uname"
+    'gen-key'|'g')
+	# set gnupg home
+	GNUPGHOME="$GNUPGHOME_HOST"
+	gen_key "$@"
 	;;
 
-    'remove-user-userids'|'remove-user-userid'|'r')
-	uname="$1"
-	shift
-	if [ -z "$uname" ] ; then
-	    failure "You must specify user."
-	fi
-	if [ -z "$1" ] ; then
-	    failure "You must specify at least one user ID."
-	fi
-
-	# set variables for the user
-	AUTHORIZED_USER_IDS="$MS_HOME"/authorized_user_ids/"$uname"
-
-        # make sure user's authorized_user_ids file exists
-	touch "$AUTHORIZED_USER_IDS"
+    'show-fingerprint'|'f')
+	# set gnupg home
+	GNUPGHOME="$GNUPGHOME_HOST"
+	fingerprint_server_key "$@"
+	;;
 
-	# process the user IDs
-	for userID ; do
-	    remove_userid "$userID"
-	done
+    'publish-key'|'p')
+	# set gnupg home
+	GNUPGHOME="$GNUPGHOME_HOST"
+	publish_server_key
+	;;
 
-	log "Run the following to update user's authorized_keys file:"
-	log "$PGRM update-users $uname"
+    'trust-key'|'t')
+	trust_key "$@"
 	;;
 
     'help'|'h'|'?')
@@ -240,3 +444,5 @@ case $COMMAND in
 Type '$PGRM help' for usage."
         ;;
 esac
+
+exit "$ERR"