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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # net-forward 2 | 3 | Simple plugin that lest you create a local port listener on your personal machine 4 | that redirects to an arbitrary TCP service that the Cluster can see. This is 5 | similar to `kubectl port-forward` without the restriction that forwarding can 6 | only use Pods or Services as destinations. 7 | 8 | This is intended to be flexible for people debugging network issues, testing 9 | whether objects are able to communicate with eachother, and from a security 10 | perspective, making it easier for pentesters to target other services on 11 | adjacent subnets from the comfort of their own machine. 12 | 13 | ## Examples 14 | 15 | Show help: 16 | 17 | `kubectl net-forward -h` 18 | 19 | Let the plugin prompt you for information: 20 | 21 | `kubectl net-forward` 22 | 23 | Make a local forwarder on port 9999 that redirects to https://10.24.0.1 in the cluster: 24 | 25 | `kubectl net-forward -i 10.24.0.1 -p 443` 26 | 27 | Make a local forwarder on port 8888 that redirects to http://169.254.169.254 from within the cluster: 28 | 29 | `kubectl net-forward -i 169.254.169.254 -p 80 -l 8888` 30 | 31 | Make a local forwarder inside the "testing" namespace and have it connect to an IP in the "default" namespace (e.g. 10.23.10.3): 32 | 33 | `kubectl net-forward -n testing -i 10.23.10.3 -p 80` 34 | 35 | ## Details 36 | 37 | This works the same way as `port-forward`, when you run this, it will create a 38 | Pod running the alpine:socat image and then configure it to redirect to the service 39 | of your choosing. 40 | 41 | ## Future plans 42 | 43 | - [ ] Rewrite into Go to support common cli stuff 44 | - [ ] Suggest some useful endpoints to users (API endpoint, discovered services, metadata service) 45 | - [ ] Add support for full proxy mode (like ssh -D) 46 | - [ ] Support a service discovery mode (ie nmap) 47 | 48 | ## FAQ 49 | 50 | **How is this different than port-forward** 51 | `kubectl port-forward` requires that you give it a Pod or service and a port. Like `kubectl port-forward Pod/my-app 9999` 52 | This restriction is useful when you're a cluster-admin but for security testing it's useful 53 | to make arbitrary connection to other services that you've discovered. 54 | 55 | **Why would you want to use this?** 56 | One example is the case where you wanted to verify whether the network controls you've setup 57 | properly prevent a Pod in a namespace from accessing the Pod of another namespace. Maybe you've 58 | configured a Network Policy that prevents Default/Pod/appA from accessing Secure/Pod/appB. 59 | 60 | For security folks, this lets you proxy communications to any host in the cluster for a variety 61 | of things. I personnly like doing it because I have all of my favorite testing tools on my 62 | laptop and now can just point it another service in the cluster without having to tool up a Pod 63 | or deploy a custom image. 64 | 65 | -------------------------------------------------------------------------------- /net-forward: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | # author: AntiTree 3 | 4 | function description() { 5 | echo -e "\nDescription:\n This plugin allows you to forward to adjacent network services exposed within the cluster. \ 6 | It can also help find services for you and help you forward to them.\n\n 7 | kubectl net_forward [-i DESTIP] [-p DESTPORT] [-l LISTENPORT] [-n NAMESPACE] \n 8 | \n - To choose a specific namespace to connect from run:\n\tkubectl net_forward -n YOURNAMESPACE 9 | \n - To choose an IP to connect to run:\n\tkubectl net_forward -i 10.24.0.1 10 | \n - To choose a port to connect to run:\n\tkubectl net_forward -p 80 11 | \n - Set IP, port, and local listening port: \n\tkubect net_forward -i 10.24.0.1 -p 443 -l 8888 12 | " 13 | exit 0 14 | } 15 | 16 | function _kube_get_ips() { 17 | # Get a list of pods 18 | # Lookup their internal IPs 19 | # Return list of pods and IPs exposed 20 | echo "on the roadmap" 21 | } 22 | 23 | function _deploy_nmap() { 24 | # Create an nmap pod 25 | # Prompt to confirm which subnets (1.g. 10.23.0.0/16) 26 | # Ping sweep the subnets 27 | # create a status bar 28 | # Collect the results 29 | # return a table 30 | echo "on the roadmap" 31 | } 32 | 33 | function _kube_list_pods() { 34 | # get list of pods that are accessible 35 | NS_ARG="--all-namespaces" 36 | [[ -n "$1" ]] && NS_ARG="-n ${1}" 37 | IFS=';' read -ra pods <<< "$(kubectl get pods $NS_ARG -o go-template='{{range .items}}{{.metadata.name}}:{{.metadata.namespace}}:{{.status.phase}}{{"\n"}}{{end}}' | sort -k 2 -k 1 -t: | tr '\n' ';')" 38 | 39 | local count=1 40 | lines=$(for i in ${pods[@]}; do 41 | IFS=":" read -ra TOKS <<< "${i}" 42 | printf " $count) ${TOKS[0]}\t${TOKS[1]}\t${TOKS[2]}\n" 43 | ((count=count+1)) 44 | done | column -t) 45 | count=$(echo "$lines" | wc -l) 46 | echo "$lines" >&2 47 | local sel=0 48 | while [[ $sel -lt 1 || $sel -gt $count ]]; do 49 | read -p "Select a Pod: " sel >&2 50 | done 51 | echo "${pods[(sel-1)]}" 52 | } 53 | 54 | function _kube_list_pod_containers() { 55 | echo "I'm in list containers" 56 | POD=$1 57 | NAMESPACE=$2 58 | IFS=';' read -ra items <<< "$(kubectl get pod ${POD} -n ${NAMESPACE} -o go-template='{{range .spec.containers}}{{.name}}{{"\n"}}{{end}}' | tr '\n' ';')" 59 | local count=1 60 | lines=$(for i in ${items[@]}; do 61 | printf " $count) ${i}\n" 62 | ((count=count+1)) 63 | done | column -t) 64 | count=$(echo "$lines" | wc -l) 65 | if [[ $count -gt 1 ]]; then 66 | printf "\nPod has multiple containers:\n" >&2 67 | echo "$lines" >&2 68 | local sel=0 69 | while [[ $sel -lt 1 || $sel -gt $count ]]; do 70 | read -p "Select a Container: " sel >&2 71 | done 72 | fi 73 | echo "${items[(sel-1)]}" 74 | } 75 | 76 | #SEL=$(_kube_list_pods) 77 | #IFS=":" read -ra POD <<< "${SEL}" 78 | 79 | 80 | while getopts "hn:i:p:l:" arg; do 81 | case $arg in 82 | n) # Add Namespace 83 | export NAMESPACE="${OPTARG}" 84 | ;; 85 | 86 | i) # Add IP 87 | export IP="${OPTARG}" 88 | ;; 89 | 90 | p) # Add port 91 | export PORT="${OPTARG}" 92 | ;; 93 | 94 | h) # Show help 95 | description 96 | exit 1 97 | ;; 98 | 99 | l) # Adjust listener 100 | export LISTENER="${OPTARG}" 101 | ;; 102 | esac 103 | done 104 | shift $((OPTIND-1)) 105 | 106 | # Configure IP address 107 | if [ -z $IP ]; then 108 | read -p "Enter a Destination IP address: " IP >&2 109 | fi 110 | 111 | # Configure port 112 | if [ -z $PORT ]; then 113 | read -p "Enter Destination service port: [80] " PORT >&2 114 | PORT=${PORT:-80} 115 | fi 116 | echo "Setting up connection to $IP:$PORT" 117 | 118 | # Defining local listening port 119 | if [ -z $LISTENER ]; then 120 | export LISTENER=9999 121 | fi 122 | 123 | # Kubectl command to run 124 | KUBECTL='kubectl' 125 | 126 | # Set namespace to use 127 | if [ -z ${NAMESPACE} ]; then 128 | NAMESPACECMD="" 129 | else 130 | NAMESPACECMD="-n $NAMESPACE" 131 | fi 132 | 133 | # Random pod name 134 | PODNAME="net-forward-socat-$(env LC_ALL=C tr -dc a-z0-9