X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=src%2Fmonkeysphere;h=59cb3d6ac45764e255fa1135f2eecdee24ca5541;hb=b7a13e19393e347ba66196a49e972d722d7d4780;hp=5e8b184bf8c15c0eca8b70fbc9875f658ed49d02;hpb=81ac4c29ed6552fcd7a17502c3fd0e7fe6f42e71;p=monkeysphere.git

diff --git a/src/monkeysphere b/src/monkeysphere
index 5e8b184..59cb3d6 100755
--- a/src/monkeysphere
+++ b/src/monkeysphere
@@ -4,6 +4,8 @@
 #
 # The monkeysphere scripts are written by:
 # Jameson Rollins <jrollins@fifthhorseman.net>
+# Jamie McClelland <jm@mayfirst.org>
+# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
 #
 # They are Copyright 2008, and are all released under the GPL, version 3
 # or later.
@@ -32,23 +34,23 @@ umask 077
 ########################################################################
 
 usage() {
-cat <<EOF
+    cat <<EOF >&2
 usage: $PGRM <subcommand> [options] [args]
 MonkeySphere client tool.
 
 subcommands:
-  update-known_hosts (k) [HOST]...  update known_hosts file
-  update-authorized_keys (a)        update authorized_keys file
-  gen-subkey (g) KEYID              generate an 'a' capable subkey
-    -l|--length BITS                  key length in bits (2048)
-    -e|--expire EXPIRE                date to expire
-  help (h,?)                        this help
+ update-known_hosts (k) [HOST]...    update known_hosts file
+ update-authorized_keys (a)          update authorized_keys file
+ gen-subkey (g) [KEYID]              generate an authentication subkey
+   --length (-l) BITS                  key length in bits (2048)
+   --expire (-e) EXPIRE                date to expire
+ subkey-to-ssh-agent (s)             store authentication subkey in ssh-agent
+ help (h,?)                          this help
 
 EOF
 }
 
 # generate a subkey with the 'a' usage flags set
-# FIXME: this needs some tweaking to clean it up
 gen_subkey(){
     local keyLength
     local keyExpire
@@ -89,9 +91,22 @@ gen_subkey(){
 	esac
     done
 
-    keyID="$1"
+    if [ -z "$1" ] ; then
+	# find all secret keys
+	keyID=$(gpg --with-colons --list-secret-keys | grep ^sec | cut -f5 -d: | sort -u)
+	# if multiple sec keys exist, fail
+	if (( $(echo "$keyID" | wc -l) > 1 )) ; then
+	    echo "Multiple secret keys found:"
+	    echo "$keyID"
+	    failure "Please specify which primary key to use."
+	fi
+    else
+	keyID="$1"
+    fi
     if [ -z "$keyID" ] ; then
-	failure "You must specify the key ID of your primary key."
+	failure "You have no secret key available.  You should create an OpenPGP
+key before joining the monkeysphere. You can do this with:
+   gpg --gen-key"
     fi
 
     # get key output, and fail if not found
@@ -100,7 +115,7 @@ gen_subkey(){
 
     # fail if multiple sec lines are returned, which means the id
     # given is not unique
-    if [ $(echo "$gpgOut" | grep '^sec:' | wc -l) -gt '1' ] ; then
+    if [ $(echo "$gpgOut" | grep -c '^sec:') -gt '1' ] ; then
 	failure "Key ID '$keyID' is not unique."
     fi
 
@@ -115,25 +130,7 @@ gen_subkey(){
 
     # set subkey defaults
     # prompt about key expiration if not specified
-    if [ -z "$keyExpire" ] ; then
-	cat <<EOF
-Please specify how long the key should be valid.
-         0 = key does not expire
-      <n>  = key expires in n days
-      <n>w = key expires in n weeks
-      <n>m = key expires in n months
-      <n>y = key expires in n years
-EOF
-	while [ -z "$keyExpire" ] ; do
-	    read -p "Key is valid for? (0) " keyExpire
-	    if ! test_gpg_expire ${keyExpire:=0} ; then
-		echo "invalid value"
-		unset keyExpire
-	    fi
-	done
-    elif ! test_gpg_expire "$keyExpire" ; then
-	failure "invalid key expiration value '$keyExpire'."
-    fi
+    keyExpire=$(get_gpg_expiration "$keyExpire")
 
     # generate the list of commands that will be passed to edit-key
     editCommands=$(cat <<EOF
@@ -149,9 +146,116 @@ save
 EOF
 )
 
-    log "generating subkey..."
-    echo "$editCommands" | gpg --expert --command-fd 0 --edit-key "$keyID"
-    log "done."
+    log verbose "generating subkey..."
+    fifoDir=$(mktemp -d)
+    (umask 077 && mkfifo "$fifoDir/pass")
+    echo "$editCommands" | gpg --passphrase-fd 3 3< "$fifoDir/pass" --expert --command-fd 0 --edit-key "$keyID" &
+
+    passphrase_prompt  "Please enter your passphrase for $keyID: " "$fifoDir/pass"
+
+    rm -rf "$fifoDir"
+    wait
+    log verbose "done."
+}
+
+function subkey_to_ssh_agent() {
+    # try to add all authentication subkeys to the agent:
+
+    local sshaddresponse
+    local secretkeys
+    local authsubkeys
+    local workingdir
+    local keysuccess
+    local subkey
+    local publine
+    local kname
+
+    if ! test_gnu_dummy_s2k_extension ; then
+	failure "Your version of GnuTLS does not seem capable of using with gpg's exported subkeys.
+You may want to consider patching or upgrading.
+
+For more details, see:
+ http://lists.gnu.org/archive/html/gnutls-devel/2008-08/msg00005.html"
+    fi
+
+    # if there's no agent running, don't bother:
+    if [ -z "$SSH_AUTH_SOCK" ] || ! which ssh-add >/dev/null ; then
+	failure "No ssh-agent available."
+    fi
+
+    # and if it looks like it's running, but we can't actually talk to
+    # it, bail out:
+    ssh-add -l >/dev/null
+    sshaddresponse="$?"
+    if [ "$sshaddresponse" = "2" ]; then
+	failure "Could not connect to ssh-agent"
+    fi
+    
+    # get list of secret keys (to work around https://bugs.g10code.com/gnupg/issue945):
+    secretkeys=$(gpg --list-secret-keys --with-colons --fixed-list-mode --fingerprint | \
+	grep '^fpr:' | cut -f10 -d: | awk '{ print "0x" $1 "!" }')
+
+    if [ -z "$secretkeys" ]; then
+	failure "You have no secret keys in your keyring!
+You might want to run 'gpg --gen-key'."
+    fi
+    
+    authsubkeys=$(gpg --list-secret-keys --with-colons --fixed-list-mode \
+	--fingerprint --fingerprint $secretkeys | \
+	cut -f1,5,10,12 -d: | grep -A1 '^ssb:[^:]*::[^:]*a[^:]*$' | \
+	grep '^fpr::' | cut -f3 -d: | sort -u)
+
+    if [ -z "$authsubkeys" ]; then
+	failure "no authentication-capable subkeys available.
+You might want to 'monkeysphere gen-subkey'"
+    fi
+
+    workingdir=$(mktemp -d)
+    umask 077
+    mkfifo "$workingdir/passphrase"
+    keysuccess=1
+
+    # FIXME: we're currently allowing any other options to get passed
+    # through to ssh-add.  should we limit it to known ones?  For
+    # example: -d or -c and/or -t <lifetime> 
+
+    for subkey in $authsubkeys; do 
+	# choose a label by which this key will be known in the agent:
+	# we are labelling the key by User ID instead of by
+	# fingerprint, but filtering out all / characters to make sure
+	# the filename is legit.
+
+	primaryuid=$(gpg --with-colons --list-key "0x${subkey}!" | grep '^pub:' | cut -f10 -d: | tr -d /)
+
+	#kname="[monkeysphere] $primaryuid"
+	kname="$primaryuid"
+
+	if [ "$1" = '-d' ]; then
+	    # we're removing the subkey:
+	    gpg --export "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname"
+	    (cd "$workingdir" && ssh-add -d "$kname")
+	else
+	    # we're adding the subkey:
+	    mkfifo "$workingdir/$kname"
+	    gpg --quiet --passphrase-fd 3 3<"$workingdir/passphrase" \
+		--export-options export-reset-subkey-passwd,export-minimal,no-export-attributes \
+		--export-secret-subkeys "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname" &
+	    (cd "$workingdir" && DISPLAY=nosuchdisplay SSH_ASKPASS=/bin/false ssh-add "$@" "$kname" </dev/null )&
+
+	    passphrase_prompt "Enter passphrase for key $kname: " "$workingdir/passphrase"
+	    wait %2
+	fi
+	keysuccess="$?"
+
+	rm -f "$workingdir/$kname"
+    done
+
+    rm -rf "$workingdir"
+
+    # FIXME: sort out the return values: we're just returning the
+    # success or failure of the final authentication subkey in this
+    # case.  What if earlier ones failed?
+    exit "$keysuccess"
 }
 
 ########################################################################
@@ -169,7 +273,7 @@ unset AUTHORIZED_KEYS
 [ -r "${ETC}/monkeysphere.conf" ] && . "${ETC}/monkeysphere.conf"
 
 # set monkeysphere home directory
-MONKEYSPHERE_HOME=${MONKEYSPHERE_HOME:="${HOME}/.config/monkeysphere"}
+MONKEYSPHERE_HOME=${MONKEYSPHERE_HOME:="${HOME}/.monkeysphere"}
 mkdir -p -m 0700 "$MONKEYSPHERE_HOME"
 
 # load local config
@@ -177,8 +281,18 @@ mkdir -p -m 0700 "$MONKEYSPHERE_HOME"
 
 # set empty config variables with ones from the environment, or from
 # config file, or with defaults
+LOG_LEVEL=${MONKEYSPHERE_LOG_LEVEL:=${LOG_LEVEL:="INFO"}}
 GNUPGHOME=${MONKEYSPHERE_GNUPGHOME:=${GNUPGHOME:="${HOME}/.gnupg"}}
-KEYSERVER=${MONKEYSPHERE_KEYSERVER:=${KEYSERVER:="subkeys.pgp.net"}}
+KEYSERVER=${MONKEYSPHERE_KEYSERVER:="$KEYSERVER"}
+# if keyserver not specified in env or monkeysphere.conf,
+# look in gpg.conf
+if [ -z "$KEYSERVER" ] ; then
+    if [ -f "${GNUPGHOME}/gpg.conf" ] ; then
+	KEYSERVER=$(grep -e "^[[:space:]]*keyserver " "${GNUPGHOME}/gpg.conf" | tail -1 | awk '{ print $2 }')
+    fi
+fi
+# if it's still not specified, use the default
+KEYSERVER=${KEYSERVER:="subkeys.pgp.net"}
 CHECK_KEYSERVER=${MONKEYSPHERE_CHECK_KEYSERVER:=${CHECK_KEYSERVER:="true"}}
 KNOWN_HOSTS=${MONKEYSPHERE_KNOWN_HOSTS:=${KNOWN_HOSTS:="${HOME}/.ssh/known_hosts"}}
 HASH_KNOWN_HOSTS=${MONKEYSPHERE_HASH_KNOWN_HOSTS:=${HASH_KNOWN_HOSTS:="true"}}
@@ -193,6 +307,7 @@ REQUIRED_USER_KEY_CAPABILITY=${MONKEYSPHERE_REQUIRED_USER_KEY_CAPABILITY:="a"}
 # permissions
 export GNUPGHOME
 mkdir -p -m 0700 "$GNUPGHOME"
+export LOG_LEVEL
 
 # get subcommand
 COMMAND="$1"
@@ -203,8 +318,9 @@ case $COMMAND in
     'update-known_hosts'|'update-known-hosts'|'k')
 	MODE='known_hosts'
 
+	# check permissions on the known_hosts file path
 	if ! check_key_file_permissions "$USER" "$KNOWN_HOSTS" ; then
-	    failure "Improper permissions on known_hosts file."
+	    failure "Improper permissions on known_hosts file path."
 	fi
 
         # if hosts are specified on the command line, process just
@@ -216,8 +332,10 @@ case $COMMAND in
         # otherwise, if no hosts are specified, process every host
         # in the user's known_hosts file
 	else
-	    if [ ! -s "$KNOWN_HOSTS" ] ; then
-		failure "known_hosts file '$KNOWN_HOSTS' is empty or does not exist."
+	    # exit if the known_hosts file does not exist
+	    if [ ! -e "$KNOWN_HOSTS" ] ; then
+		log error "known_hosts file '$KNOWN_HOSTS' does not exist."
+		exit
 	    fi
 
 	    process_known_hosts
@@ -228,13 +346,20 @@ case $COMMAND in
     'update-authorized_keys'|'update-authorized-keys'|'a')
 	MODE='authorized_keys'
 
-        # fail if the authorized_user_ids file is empty
-	if [ ! -s "$AUTHORIZED_USER_IDS" ] ; then
-	    failure "authorized_user_ids file '$AUTHORIZED_USER_IDS' is empty or does not exist."
+	# check permissions on the authorized_user_ids file path
+	if ! check_key_file_permissions "$USER" "$AUTHORIZED_USER_IDS" ; then
+	    failure "Improper permissions on authorized_user_ids file path."
 	fi
 
-	if ! check_key_file_permissions "$USER" "$AUTHORIZED_USER_IDS" ; then
-	    failure "Improper permissions on authorized_user_ids file."
+	# check permissions on the authorized_keys file path
+	if ! check_key_file_permissions "$USER" "$AUTHORIZED_KEYS" ; then
+	    failure "Improper permissions on authorized_keys file path."
+	fi
+
+        # exit if the authorized_user_ids file is empty
+	if [ ! -e "$AUTHORIZED_USER_IDS" ] ; then
+	    log error "authorized_user_ids file '$AUTHORIZED_USER_IDS' does not exist."
+	    exit
 	fi
 
 	# process authorized_user_ids file
@@ -246,7 +371,11 @@ case $COMMAND in
 	gen_subkey "$@"
 	;;
 
-    'help'|'h'|'?')
+    'subkey-to-ssh-agent'|'s')
+	subkey_to_ssh_agent "$@"
+	;;
+
+    '--help'|'help'|'-h'|'h'|'?')
         usage
         ;;