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new: [rsync-backup-target] add recover key mechanism
new: [rsync-backup-target] add recover key mechanism
This allows to get a one-time credential to have read access on specified backup slot. Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>pull/1/head
10 changed files with 257 additions and 15 deletions
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18rsync-backup-target/README.org
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3rsync-backup-target/build/Dockerfile
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2rsync-backup-target/build/entrypoint.sh
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7rsync-backup-target/build/src/etc/sudoers.d/recover
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1rsync-backup-target/build/src/etc/sudoers.d/rsync
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76rsync-backup-target/build/src/usr/local/sbin/request-recovery-key
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9rsync-backup-target/build/src/usr/local/sbin/ssh-admin-cmd-validate
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3rsync-backup-target/build/src/usr/local/sbin/ssh-cmd-validate
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97rsync-backup-target/build/src/usr/local/sbin/ssh-recover-cmd-validate
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52rsync-backup-target/build/src/usr/local/sbin/ssh-update-keys
@ -0,0 +1,7 @@ |
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## allow admin users to request a recovery key, this is really not |
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## sufficient, but the real check is done on the |
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## ``ssh-admin-cmd-validate`` side. |
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|
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%rsync ALL=(root) NOPASSWD: /usr/local/sbin/request-recovery-key * |
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%rsync ALL=(root) NOPASSWD: /bin/touch /etc/rsync/keys/recover/* |
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%rsync ALL=(root) NOPASSWD: /usr/local/sbin/ssh-update-keys |
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@ -0,0 +1,76 @@ |
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#!/bin/bash |
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RSYNC_KEY_PATH=/etc/rsync/keys |
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RECOVER_KEY_PATH=${RSYNC_KEY_PATH}/recover |
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ANSI_ESC=$'\e[' |
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NORMAL="${ANSI_ESC}0m" |
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GRAY="${ANSI_ESC}1;30m" |
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RED="${ANSI_ESC}1;31m" |
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GREEN="${ANSI_ESC}1;32m" |
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YELLOW="${ANSI_ESC}1;33m" |
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BLUE="${ANSI_ESC}1;34m" |
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PINK="${ANSI_ESC}1;35m" |
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CYAN="${ANSI_ESC}1;36m" |
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WHITE="${ANSI_ESC}1;37m" |
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DARKGRAY="${ANSI_ESC}0;30m" |
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DARKRED="${ANSI_ESC}0;31m" |
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DARKGREEN="${ANSI_ESC}0;32m" |
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DARKYELLOW="${ANSI_ESC}0;33m" |
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DARKBLUE="${ANSI_ESC}0;34m" |
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DARKPINK="${ANSI_ESC}0;35m" |
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DARKCYAN="${ANSI_ESC}0;36m" |
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DARKWHITE="${ANSI_ESC}0;37m" |
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ssh:mk-private-key() { |
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local comment="$1" |
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( |
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tmpdir=$(mktemp -d) |
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chmod go-rwx "$tmpdir" |
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ssh-keygen -t rsa -N "" -f "$tmpdir/rsync_rsa" -C "$service_name@$host" >/dev/null |
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cat "$tmpdir/rsync_rsa" |
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rm -rf "$tmpdir" |
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) |
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} |
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md5() { |
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local md5 |
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md5=$(cat | md5sum) |
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echo "${md5%% *}" |
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} |
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request-recovery-key() { |
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local label="$1" ident="$2" key public_key |
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## Admin should have claimed the ident with at least one backup key |
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if ! [ -e "${RSYNC_KEY_PATH}/backup/$label/$ident.pub" ]; then |
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echo "Error: Current admin '$label' has no ident '$ident' claimed." >&2 |
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return 1 |
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fi |
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## Find new label |
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while true; do |
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key=$(ssh:mk-private-key "recover@$ident") |
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md5=$(printf "%s" "$key" | md5) |
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[ -e "${RECOVER_KEY_PATH}/$md5" ] || break |
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done |
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mkdir -p "${RECOVER_KEY_PATH}" |
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public_key=$(ssh-keygen -y -f <(printf "%s\n" "$key")) |
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printf "%s %s\n" "$public_key" "recover@$ident" > "${RECOVER_KEY_PATH}/$md5.pub" |
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touch "${RECOVER_KEY_PATH}/$md5" |
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chmod go-rwx "${RECOVER_KEY_PATH}/$md5" |
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printf "%s\n" "$key" | tee -a "${RECOVER_KEY_PATH}/$md5" |
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/usr/local/sbin/ssh-update-keys |
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} |
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request-recovery-key "$@" |
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@ -0,0 +1,97 @@ |
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#!/bin/bash |
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## Note that the shebang is not used, but it's the login shell that |
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## will execute this command. |
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RSYNC_KEY_PATH=/etc/rsync/keys |
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RECOVER_KEY_PATH=${RSYNC_KEY_PATH}/recover |
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exname=$(basename "$0") |
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mkdir -p /var/log/rsync |
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LOG="/var/log/rsync/$exname.log" |
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ssh_connection=(${SSH_CONNECTION}) |
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SSH_SOURCE_IP="${ssh_connection[0]}:${ssh_connection[1]}" |
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log() { |
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printf "%s [%s] %s - %s\n" \ |
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"$(date --rfc-3339=seconds)" "$$" "$SSH_SOURCE_IP" "$*" \ |
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>> "$LOG" |
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} |
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log "NEW RECOVER CONNECTION" |
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if [ -z "$1" ] || ! [[ "$1" =~ ^[a-z0-9]+$ ]]; then |
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log "INVALID SETUP, ARG 1 SHOULD BE MD5 AND IS: '$1'" |
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echo "Your command has been rejected. Contact administrator." |
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exit 1 |
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fi |
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md5="$1" |
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log "RECOVER KEY $md5" |
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if [ -z "$2" ] || ! [[ "$2" =~ ^[a-zA-Z0-9._-]+$ ]]; then |
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log "INVALID SETUP, IDENT IS: '$1'" |
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echo "Your command has been rejected. Contact administrator." |
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exit 1 |
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fi |
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ident="$2" |
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log "IDENTIFIED AS $ident" |
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reject() { |
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log "REJECTED: $SSH_ORIGINAL_COMMAND" |
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# echo "ORIG: $SSH_ORIGINAL_COMMAND" >&2 |
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echo "Your command has been rejected and reported to sys admin." >&2 |
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exit 1 |
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} |
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if [[ "$SSH_ORIGINAL_COMMAND" =~ [\&\(\{\;\<\>\`\$\}] ]]; then |
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log "BAD CHARS DETECTED" |
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# echo "Bad chars: $SSH_ORIGINAL_COMMAND" >&2 |
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reject |
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fi |
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if [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server --sender -"[vnloHgDtpArRzCeiLsfx\.]+(" --"[a-z=%-]+|" --partial-dir .rsync-partial")*" . /var/mirror/$ident"(|/.*)$ ]]; then |
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## Interpret \ to allow passing spaces (want to avoid possible issue with \n) |
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#read -a ssh_args <<< "${SSH_ORIGINAL_COMMAND}" |
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ssh_args=(${SSH_ORIGINAL_COMMAND}) |
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last_arg="${ssh_args[@]: -1:1}" |
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if ! new_path=$(realpath "$last_arg" 2>/dev/null); then |
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log "FINAL PATH INVALID" |
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reject |
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fi |
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if [[ "$new_path" != "$last_arg" ]] && |
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[[ "$new_path" != "/var/mirror/$ident/"* ]] && |
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[[ "$new_path" != "/var/mirror/$ident" ]]; then |
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log "FINAL PATH SUSPICIOUS" |
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reject |
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fi |
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sudo /usr/local/sbin/ssh-update-keys |
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if ! [ -e "${RECOVER_KEY_PATH}/$md5" ]; then |
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log "RECOVERY KEY $md5 JUST EXPIRED" |
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reject |
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fi |
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log "ACCEPTED RECOVER COMMAND: $SSH_ORIGINAL_COMMAND" |
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sudo "${ssh_args[@]}" |
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errlvl="$?" |
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for key_file in "${RECOVER_KEY_PATH}/$md5"{,.pub}; do |
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[ -e "$key_file" ] || continue |
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sudo touch "$key_file" ## Update modified time to keep key longer |
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done |
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exit "$errlvl" |
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else |
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log "REFUSED COMMAND AS IT DOESN'T MATCH ANY EXPECTED COMMAND" |
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reject |
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fi |
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@ -1,36 +1,68 @@ |
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#!/bin/bash |
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## Keep in mind possible race conditions as this script will be called |
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## from different place to update the access tokens. |
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## |
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## code |
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## Code |
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## |
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KEYS=/etc/rsync/keys |
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RSYNC_KEY_PATH=/etc/rsync/keys |
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RSYNC_HOME=/var/lib/rsync |
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BACKUP_KEY_PATH=${RSYNC_KEY_PATH}/backup |
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RECOVER_KEY_PATH=${RSYNC_KEY_PATH}/recover |
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mkdir -p "$RSYNC_HOME/.ssh" "$RECOVER_KEY_PATH" |
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## delete old recovery keys |
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find "${RECOVER_KEY_PATH}" \ |
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-maxdepth 1 -not -newermt "-15 minutes" \ |
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-type f -delete |
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mkdir -p "$RSYNC_HOME/.ssh" |
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## |
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## New |
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## |
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touch "$RSYNC_HOME"/.ssh/authorized_keys.new |
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pid=$$ |
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new="$RSYNC_HOME"/.ssh/authorized_keys.tmp."$pid" |
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touch "$new" |
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for f in "$KEYS"/backup/*/*.pub; do |
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for f in "$BACKUP_KEY_PATH"/*/*.pub "$RECOVER_KEY_PATH"/*.pub; do |
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[ -e "$f" ] || continue |
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content=$(cat "$f") |
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if [[ "$content" == *" "*" "*@* ]]; then |
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ident="${content##*@}" |
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else |
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ident="${f##*/}" |
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ident="${ident%.pub}" |
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fi |
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if ! [[ "$ident" =~ ^[a-zA-Z0-9._-]+$ ]]; then |
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echo "bad: '$ident'" >&2 |
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continue |
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fi |
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echo "command=\"/usr/local/sbin/ssh-cmd-validate \\\"$ident\\\"\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty $content" |
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done >> "$RSYNC_HOME"/.ssh/authorized_keys.new |
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if [[ "$f" == "${RECOVER_KEY_PATH}"/*.pub ]]; then |
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basename=${f##*/} |
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basename=${basename%.pub} |
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cmd="/usr/local/sbin/ssh-recover-cmd-validate $basename" |
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else |
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cmd=/usr/local/sbin/ssh-cmd-validate |
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fi |
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echo "command=\"$cmd \\\"$ident\\\"\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty $content" |
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done >> "$new" |
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[ -e ""$RSYNC_HOME"/.ssh/authorized_keys" ] && |
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[ -e "$RSYNC_HOME"/.ssh/authorized_keys ] && |
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mv "$RSYNC_HOME"/.ssh/authorized_keys{,.old} |
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mv "$RSYNC_HOME"/.ssh/authorized_keys{.new,} |
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chown rsync:rsync -R "$RSYNC_HOME"/.ssh -R |
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## XXXvlab: Atomic operation. It's the last call to this instruction |
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## that will prevail. There are some very special cases where some |
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## added key would not be added as expected: for instance an older |
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## call to ``ssh-update-key``, if made before a specific public key |
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## file was added to directory, could take a longer time to reach this |
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## next instruction than a more recent call (that would be after |
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## the specific public key was added). |
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mv "$new" "$RSYNC_HOME"/.ssh/authorized_keys |
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chown rsync:rsync "$RSYNC_HOME"/.ssh -R |
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