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bgp.sh
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#!/bin/bash
############################################################
# Create a BGP lab in Azure using VNGs and/or Cisco CSR NVAs
# Syntax:
# bgp.sh <router_list> <connection_list> <resource_group_name> <azure_region> <IKE pre-shared key>
# - <router_list> is a comma-separated list of devices to deploy. Each device takes the form "id:type:asn"
# "id" is a unique integer to identify the device
# "type" is either vng, vng1 (active/passive vng) or csr
# "asn" is the BGP ASN to be configured on that device
# - <connection_list> is a comma-separated list of the devices to connect to each other. Each
# connection takes the form "device1_id:device2_id".
# Alternatively you can specify connections in the form "device1_id:device2_id:protocol", where protocol
# can be "bgp", "ospf", "bgpospf" or "none". If you dont specify a protocol, "bgp" is taken per default.
# - <resource_group_name>: all devices will be created in this resource group in the active Azure subscription
# - <azure_region>: all devices will be created in this Azure region
# - <pre-shared key>: this key will be used as pre-shared key for the IPsec connections, as well as for the
# password of usernames in CSR (additionally to SSH key auth)
#
# Examples:
#
# Basic example with 1 VNG connected to one CSR:
# bgp.sh "1:vng:65501,2:csr:65502" "1:2" mylab northeurope mypresharedkey
# 4 CSRs connected in full mesh:
# bgp.sh "1:csr:65501,2:csr:65502,3:csr:65503,4:csr:65504" "1:2,1:3,2:4,3:4,1:4,2:3" mylab northeurope mypresharedkey
# 2 VNGs and 2 CSRs connected in full mesh:
# bgp.sh "1:vng:65001,2:vng:65002,3:csr:65100,4:csr:65100" "1:2,1:3,1:4,2:4,2:3,3:4" mylab northeurope mypresharedkey
# 2 VNGs and 2 CSRs connected in full mesh, with a 5th router connected via OSPF to CSR3 and CSR4 in triangle:
# bgp.sh "1:vng1:65001,2:vng:65002,3:csr:65100,4:csr:65100,5:csr:65100" "1:2,1:3,1:4,2:4,2:3,3:4:bgpospf,3:5:ospf,4:5:ospf" mylab northeurope mypresharedkey
# Environment simulating 2 ExpressRoute locations (note you cannot use the 12076 ASN in Local Gateways):
# bgp.sh "1:vng:65515,2:vng:65515,3:csr:22076,4:csr:22076,5:csr:65001,6:csr:65002" "1:3,1:4,2:3,2:4,3:5,4:6,5:6" mylab northeurope mypresharedkey
#
# bash and zsh tested
#
# Jose Moreno, August 2020
############################################################
# Waits until a resource finishes provisioning
# Example: wait_until_finished <resource_id>
function wait_until_finished () {
wait_interval=60
resource_id=$1
resource_name=$(echo "$resource_id" | cut -d/ -f 9)
echo "Waiting for resource $resource_name to finish provisioning..."
start_time=$(date +%s)
state=$(az resource show --id "$resource_id" --query properties.provisioningState -o tsv 2>/dev/null)
until [[ "$state" == "Succeeded" ]] || [[ "$state" == "Failed" ]] || [[ -z "$state" ]]
do
sleep $wait_interval
state=$(az resource show --id "$resource_id" --query properties.provisioningState -o tsv)
done
if [[ -z "$state" ]]
then
echo "Something really bad happened..."
else
run_time=$(("$(date +%s)" - "$start_time"))
((minutes=run_time/60))
((seconds=run_time%60))
echo "Resource $resource_name provisioning state is $state, wait time $minutes minutes and $seconds seconds"
fi
}
# Remove special characters and empty lines from string
# Used in case the SSH session to IOS returns invalid characters (like CR aka 0x0d), but that doesnt seem to be the case,
# so left to remove empty strings for the time being
function clean_string () {
output=$1
# output=$(echo $output | tr '\r' '\n') # Replace \r with \n
output=$(echo "$output" | tr -d '\r') # Delete \r
# output=$(echo $output | tr -dc '[:alnum:]\ \.\,\n') # Remove special characters
output=$(echo "$output" | awk NF) # Remove empty lines
echo "$output"
}
# Wait until a public IP address answers via SSH
# The only thing CSR-specific is the command sent
function wait_until_csr_available () {
wait_interval=15
csr_id=$1
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" --query ipAddress -o tsv)
echo "Waiting for CSR${csr_id} with IP address $csr_ip to answer over SSH..."
start_time=$(date +%s)
ssh_command="show version | include uptime" # 'show version' contains VM name and uptime
ssh_output=$(ssh -n -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" "$ssh_command" 2>/dev/null)
until [[ -n "$ssh_output" ]]
do
sleep $wait_interval
ssh_output=$(ssh -n -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" "$ssh_command" 2>/dev/null)
done
run_time=$(("$(date +%s)" - "$start_time"))
((minutes=run_time/60))
((seconds=run_time%60))
echo "IP address $csr_ip is available (wait time $minutes minutes and $seconds seconds). Answer to SSH command \"$ssh_command\":"
clean_string "$ssh_output"
}
# Wait until all VNGs in the router list finish provisioning
function wait_for_csrs_finished () {
for router in "${routers[@]}"
do
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "csr" ]]
then
wait_until_csr_available "$id"
fi
done
}
# Add required rules to an NSG to allow traffic between the vnets (RFC1918)
function fix_nsg () {
nsg_name=$1
echo "Adding RFC1918 prefixes to NSG ${nsg_name}..."
az network nsg rule create --nsg-name "$nsg_name" -g "$rg" -n Allow_Inbound_RFC1918 --priority 2000 \
--access Allow --protocol '*' --source-address-prefixes '10.0.0.0/8' '172.16.0.0/12' '192.168.0.0/16' --direction Inbound \
--destination-address-prefixes '10.0.0.0/8' '172.16.0.0/12' '192.168.0.0/16' --destination-port-ranges '*' >/dev/null
az network nsg rule create --nsg-name "$nsg_name" -g "$rg" -n Allow_Outbound_RFC1918 --priority 2000 \
--access Allow --protocol '*' --source-address-prefixes '10.0.0.0/8' '172.16.0.0/12' '192.168.0.0/16' --direction Outbound \
--destination-address-prefixes '10.0.0.0/8' '172.16.0.0/12' '192.168.0.0/16' --destination-port-ranges '*' >/dev/null
}
# Add RFC1918 to all nsgs in the RG
function fix_all_nsgs () {
nsg_list=$(az network nsg list -g "$rg" --query '[].name' -o tsv 2>/dev/null)
echo "$nsg_list" | while read nsg
do
fix_nsg "$nsg"
done
}
# Creates BGP-enabled VNG
# ASN as parameter is optional
function create_vng () {
id=$1
asn=$2
if [[ -n "$2" ]]
then
asn=$2
else
asn=$(get_router_asn_from_id "${id}")
fi
vnet_name=vng${id}
vnet_prefix=10.${id}.0.0/16
subnet_prefix=10.${id}.0.0/24
test_vm_name=testvm${id}
test_vm_size=Standard_B1s
test_vm_subnet_prefix=10.${id}.1.0/24
type=$(get_router_type_from_id "$id")
# Create vnet
echo "Creating vnet $vnet_name..."
az network vnet create -g "$rg" -n "$vnet_name" --address-prefix "$vnet_prefix" --subnet-name GatewaySubnet --subnet-prefix "$subnet_prefix" >/dev/null
# Create test VM (to be able to see effective routes)
# Not possible to create a test VM while a gateway is Updating, therefore starting the VM creation before the gateway
test_vm_id=$(az vm show -n "$test_vm_name" -g "$rg" --query id -o tsv 2>/dev/null)
if [[ -z "$test_vm_id" ]]
then
echo "Creating test virtual machine $test_vm_name in vnet $vnet_name in new subnet $test_vm_subnet_prefix..."
az network vnet subnet create --vnet-name "$vnet_name" -g "$rg" -n testvm --address-prefixes "$test_vm_subnet_prefix" >/dev/null
# Not using $psk as password because it might not fulfill the password requirements for Azure VMs
az vm create -n "$test_vm_name" -g "$rg" -l "$location" --image UbuntuLTS --size "$test_vm_size" \
--generate-ssh-keys --authentication-type all --admin-username "$default_username" --admin-password "$psk" \
--public-ip-address "${test_vm_name}-pip" --public-ip-address-allocation static \
--vnet-name "$vnet_name" --subnet testvm --no-wait 2>/dev/null
else
echo "Virtual machine $test_vm_name already exists"
fi
# Create PIPs for gateway (this gives time as well for the test VM NICs to be created and attached to the subnet)
echo "Creating public IP addresses for gateway vng${id}..."
az network public-ip create -g "$rg" -n "vng${id}a" >/dev/null
az network public-ip create -g "$rg" -n "vng${id}b" >/dev/null
# Create VNG
vng_id=$(az network vnet-gateway show -n "vng${id}" -g "$rg" --query id -o tsv 2>/dev/null)
if [[ -z "${vng_id}" ]]
then
if [[ "$type" == "vng" ]] || [[ "$type" == "vng2" ]]
then
echo "Creating VNG vng${id} in active/active mode..."
az network vnet-gateway create -g "$rg" --sku VpnGw1 --gateway-type Vpn --vpn-type RouteBased \
--vnet "$vnet_name" -n "vng${id}" --asn "$asn" --public-ip-address "vng${id}a" "vng${id}b" --no-wait
elif [[ "$type" == "vng1" ]]
then
echo "Creating VNG vng${id} in active/passive mode..."
az network vnet-gateway create -g "$rg" --sku VpnGw1 --gateway-type Vpn --vpn-type RouteBased \
--vnet "$vnet_name" -n "vng${id}" --asn "$asn" --public-ip-address "vng${id}a" --no-wait
else
echo "Sorry, I do not understand the VNG type $type"
fi
else
echo "VNG vng${id} already exists"
fi
}
# Connect 2 VPN gateways to each other
function connect_gws () {
gw1_id=$1
gw2_id=$2
cx_type=$3
gw1_type=$(get_router_type_from_id "$gw1_id")
gw2_type=$(get_router_type_from_id "$gw2_id")
echo "Connecting vng${gw1_id} and vng${gw2_id}. Finding out information about the gateways..."
# Using Vnet-to-Vnet connections (no BGP supported)
# az network vpn-connection create -g $rg -n ${gw1_id}to${gw2_id} \
# --enable-bgp --shared-key $psk \
# --vnet-gateway1 vng${gw1_id} --vnet-gateway2 vng${gw2_id}
# Using local gws
# Create Local Gateways for vpngw1
vpngw1_name=vng${gw1_id}
vpngw1_bgp_json=$(az network vnet-gateway show -n "$vpngw1_name" -g "$rg" --query 'bgpSettings' -o json 2>/dev/null)
vpngw1_asn=$(echo "$vpngw1_bgp_json" | jq -r '.asn')
vpngw1_gw0_pip=$(echo "$vpngw1_bgp_json" | jq -r '.bgpPeeringAddresses[0].tunnelIpAddresses[0]')
vpngw1_gw0_bgp_ip=$(echo "$vpngw1_bgp_json" | jq -r '.bgpPeeringAddresses[0].defaultBgpIpAddresses[0]')
if [[ ${gw1_type} == "vng" ]] || [[ ${gw1_type} == "vng2" ]]
then
vpngw1_gw1_pip=$(echo "$vpngw1_bgp_json" | jq -r '.bgpPeeringAddresses[1].tunnelIpAddresses[0]')
vpngw1_gw1_bgp_ip=$(echo "$vpngw1_bgp_json" | jq -r '.bgpPeeringAddresses[1].defaultBgpIpAddresses[0]')
echo "Extracted info for vpngw1: ASN $vpngw1_asn, GW0 $vpngw1_gw0_pip, $vpngw1_gw0_bgp_ip. GW1 $vpngw1_gw1_pip, $vpngw1_gw1_bgp_ip."
elif [[ "$gw1_type" == "vng1" ]]
then
echo "Extracted info for vpngw1: ASN $vpngw1_asn, $vpngw1_gw0_pip, $vpngw1_gw0_bgp_ip."
else
echo "Sorry, I do not understand the VNG type $gw1_type"
fi
echo "Creating local network gateways for vng${gw1_id}..."
local_gw_id=$(az network local-gateway show -g "$rg" -n "${vpngw1_name}a" --query id -o tsv 2>/dev/null)
if [[ -z "$local_gw_id" ]]
then
az network local-gateway create -g "$rg" -n "${vpngw1_name}a" --gateway-ip-address "$vpngw1_gw0_pip" \
--local-address-prefixes "${vpngw1_gw0_bgp_ip}/32" --asn "$vpngw1_asn" --bgp-peering-address "$vpngw1_gw0_bgp_ip" --peer-weight 0 >/dev/null 2>&1
else
echo "Local gateway ${vpngw1_name}a already exists"
fi
# Create second local gateway only if the type is "vng" (default) or "vng2"
if [[ ${gw1_type} == "vng" ]] || [[ ${gw1_type} == "vng2" ]]
then
local_gw_id=$(az network local-gateway show -g "$rg" -n "${vpngw1_name}b" --query id -o tsv 2>/dev/null)
if [[ -z "$local_gw_id" ]]
then
az network local-gateway create -g "$rg" -n "${vpngw1_name}b" --gateway-ip-address "$vpngw1_gw1_pip" \
--local-address-prefixes "${vpngw1_gw1_bgp_ip}/32" --asn "$vpngw1_asn" --bgp-peering-address "$vpngw1_gw1_bgp_ip" --peer-weight 0 >/dev/null 2>&1
else
echo "Local gateway ${vpngw1_name}b already exists"
fi
fi
# Create Local Gateways for vpngw2
vpngw2_name=vng${gw2_id}
vpngw2_bgp_json=$(az network vnet-gateway show -n "$vpngw2_name" -g "$rg" -o json --query 'bgpSettings')
vpngw2_asn=$(echo "$vpngw2_bgp_json" | jq -r '.asn')
vpngw2_gw0_pip=$(echo "$vpngw2_bgp_json" | jq -r '.bgpPeeringAddresses[0].tunnelIpAddresses[0]')
vpngw2_gw0_bgp_ip=$(echo "$vpngw2_bgp_json" | jq -r '.bgpPeeringAddresses[0].defaultBgpIpAddresses[0]')
echo "Creating local network gateways for vng${gw2_id}..."
local_gw_id=$(az network local-gateway show -g "$rg" -n "${vpngw2_name}a" --query id -o tsv 2>/dev/null)
if [[ ${gw2_type} == "vng" ]] || [[ ${gw2_type} == "vng2" ]]
then
vpngw2_gw1_pip=$(echo "$vpngw2_bgp_json" | jq -r '.bgpPeeringAddresses[1].tunnelIpAddresses[0]')
vpngw2_gw1_bgp_ip=$(echo "$vpngw2_bgp_json" | jq -r '.bgpPeeringAddresses[1].defaultBgpIpAddresses[0]')
echo "Extracted info for vpngw2: ASN $vpngw2_asn GW0 $vpngw2_gw0_pip, $vpngw2_gw0_bgp_ip. GW1 $vpngw2_gw1_pip, $vpngw2_gw1_bgp_ip."
elif [[ "$gw2_type" == "vng1" ]]
then
echo "Extracted info for vpngw1: ASN $vpngw2_asn, $vpngw2_gw0_pip, $vpngw2_gw0_bgp_ip."
else
echo "Sorry, I do not understand the VNG type $gw2_type"
fi
if [[ -z "$local_gw_id" ]]
then
az network local-gateway create -g "$rg" -n "${vpngw2_name}a" --gateway-ip-address "$vpngw2_gw0_pip" \
--local-address-prefixes "${vpngw2_gw0_bgp_ip}/32" --asn "$vpngw2_asn" --bgp-peering-address "$vpngw2_gw0_bgp_ip" --peer-weight 0 >/dev/null 2>&1
else
echo "Local gateway ${vpngw2_name}a already exists"
fi
# Create second local gateway only if the type is "vng" (default) or "vng2"
if [[ ${gw2_type} == "vng" ]] || [[ ${gw2_type} == "vng2" ]]
then
local_gw_id=$(az network local-gateway show -g "$rg" -n "${vpngw2_name}b" --query id -o tsv 2>/dev/null)
if [[ -z "$local_gw_id" ]]
then
az network local-gateway create -g "$rg" -n "${vpngw2_name}b" --gateway-ip-address "$vpngw2_gw1_pip" \
--local-address-prefixes "${vpngw2_gw1_bgp_ip}/32" --asn "$vpngw2_asn" --bgp-peering-address "$vpngw2_gw1_bgp_ip" --peer-weight 0 >/dev/null 2>&1
else
echo "Local gateway ${vpngw2_name}b already exists"
fi
fi
# Create connections
echo "Connecting vng${gw1_id} to local gateways for vng${gw2_id}..."
if [[ "$cx_type" == "nobgp" ]]
then
bgp_option=""
else
bgp_option="--enable-bgp"
fi
# 1->2A
az network vpn-connection create -n "vng${gw1_id}tovng${gw2_id}a" -g "$rg" --vnet-gateway1 "vng${gw1_id}" \
--shared-key "$psk" --local-gateway2 "${vpngw2_name}a" $bgp_option >/dev/null
# 1->2B
if [[ ${gw2_type} == "vng" ]] || [[ ${gw2_type} == "vng2" ]]
then
az network vpn-connection create -n "vng${gw1_id}tovng${gw2_id}b" -g "$rg" --vnet-gateway1 "vng${gw1_id}" \
--shared-key "$psk" --local-gateway2 "${vpngw2_name}b" $bgp_option >/dev/null
fi
echo "Connecting vng${gw2_id} to local gateways for vng${gw1_id}..."
# 2->1A
az network vpn-connection create -n "vng${gw2_id}tovng${gw1_id}a" -g "$rg" --vnet-gateway1 "vng${gw2_id}" \
--shared-key "$psk" --local-gateway2 "${vpngw1_name}a" $bgp_option >/dev/null
# 2->1B
if [[ ${gw1_type} == "vng" ]] || [[ ${gw1_type} == "vng2" ]]
then
az network vpn-connection create -n "vng${gw2_id}tovng${gw1_id}b" -g "$rg" --vnet-gateway1 "vng${gw2_id}" \
--shared-key "$psk" --local-gateway2 "${vpngw1_name}b" $bgp_option >/dev/null
fi
}
# Deploy a VM in CSR's vnet, and configure CSR to route traffic
function create_vm_in_csr_vnet () {
csr_id=$1
csr_name=csr${csr_id}
vnet_name=${csr_name}
csr_vnet_prefix="10.${csr_id}.0.0/16"
csr_subnet_prefix="10.${csr_id}.0.0/24"
csr_bgp_ip="10.${csr_id}.0.10"
vm_subnet_prefix="10.${csr_id}.1.0/24"
vm_subnet_name=testvm
vm_name=testvm${csr_id}
vm_size=Standard_B1s
rt_name="${vm_name}-rt"
# Create VM
test_vm_id=$(az vm show -n "$vm_name" -g "$rg" --query id -o tsv 2>/dev/null)
if [[ -z "$test_vm_id" ]]
then
echo "Creating VM $vm_name in vnet $vnet_name..."
az vm create -n "$vm_name" -g "$rg" -l "$location" --image ubuntuLTS --size $vm_size \
--generate-ssh-keys --authentication-type all --admin-username "$default_username" --admin-password "$psk" \
--public-ip-address "${vm_name}-pip" --vnet-name "$vnet_name" --public-ip-address-allocation static \
--subnet "$vm_subnet_name" --subnet-address-prefix "$vm_subnet_prefix" --no-wait 2>/dev/null
az network route-table create -n "$rt_name" -g "$rg" -l "$location" >/dev/null
az network route-table route create -n localrange -g "$rg" --route-table-name "$rt_name" \
--address-prefix "10.0.0.0/8" --next-hop-type VirtualAppliance --next-hop-ip-address "$csr_bgp_ip" >/dev/null
az network vnet subnet update -n "$vm_subnet_name" --vnet-name "$vnet_name" -g "$rg" --route-table "$rt_name" >/dev/null
else
echo "Virtual machine $vm_name already exists"
fi
# Setting IP Forwarding for CSR
echo "Enabling IP forwarding for $csr_name..."
csr_nic_id=$(az vm show -n "$csr_name-nva" -g "$rg" --query 'networkProfile.networkInterfaces[0].id' -o tsv)
az network nic update --ids $csr_nic_id --ip-forwarding >/dev/null
}
function accept_csr_terms () {
publisher=cisco
offer=cisco-csr-1000v
sku=16_12-byol
version=$(az vm image list -p $publisher -f $offer -s $sku --all --query '[0].version' -o tsv 2>/dev/null)
# Accept terms
echo "Accepting image terms for ${publisher}:${offer}:${sku}:${version}..."
az vm image terms accept --urn "${publisher}:${offer}:${sku}:${version}" >/dev/null
# Verify
status=$(az vm image terms show --urn "${publisher}:${offer}:${sku}:${version}" --query accepted -o tsv 2>/dev/null)
if [[ "$status" != "true" ]]
then
echo "Marketplace image terms for ${publisher}:${offer}:${sku}:${version} could not be accepted, do you have access at the subscription level?"
exit
fi
}
# Creates a CSR NVA
# Example: create_csr 1
function create_csr () {
csr_id=$1
csr_name=csr${csr_id}
csr_vnet_prefix="10.${csr_id}.0.0/16"
csr_subnet_prefix="10.${csr_id}.0.0/24"
csr_bgp_ip="10.${csr_id}.0.10"
publisher=cisco
offer=cisco-csr-1000v
sku=16_12-byol
version=$(az vm image list -p $publisher -f $offer -s $sku --all --query '[0].version' -o tsv 2>/dev/null)
nva_size=Standard_B2ms
# Create CSR
echo "Creating VM csr${csr_id}-nva in Vnet $csr_vnet_prefix..."
vm_id=$(az vm show -n "csr${csr_id}-nva" -g "$rg" --query id -o tsv 2>/dev/null)
if [[ -z "$vm_id" ]]
then
az vm create -n "csr${csr_id}-nva" -g "$rg" -l "$location" --image "${publisher}:${offer}:${sku}:${version}" --size "$nva_size" \
--generate-ssh-keys --public-ip-address "csr${csr_id}-pip" --public-ip-address-allocation static \
--vnet-name "$csr_name" --vnet-address-prefix "$csr_vnet_prefix" --subnet nva --subnet-address-prefix "$csr_subnet_prefix" \
--private-ip-address "$csr_bgp_ip" --no-wait 2>/dev/null
sleep 30 # Wait 30 seconds for the creation of the PIP
else
echo "VM csr${csr_id}-nva already exists"
fi
# Adding UDP ports 500 and 4500 to NSG
nsg_name=csr${csr_id}-nvaNSG
az network nsg rule create --nsg-name "$nsg_name" -g "$rg" -n ike --priority 1010 \
--source-address-prefixes Internet --destination-port-ranges 500 4500 --access Allow --protocol Udp \
--description "UDP ports for IKE" >/dev/null
# Get public IP
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" --query ipAddress -o tsv)
# Create Local Network Gateway
echo "CSR created with IP address $csr_ip. Creating Local Network Gateway now..."
asn=$(get_router_asn_from_id "$csr_id")
local_gw_id=$(az network local-gateway show -g "$rg" -n "${csr_name}" --query id -o tsv 2>/dev/null)
if [[ -z "$local_gw_id" ]]
then
az network local-gateway create -g "$rg" -n "$csr_name" --gateway-ip-address "$csr_ip" \
--local-address-prefixes "${csr_bgp_ip}/32" --asn "$asn" --bgp-peering-address "$csr_bgp_ip" --peer-weight 0 >/dev/null 2>&1
else
echo "Local gateway ${csr_name} already exists"
fi
}
# Connects a CSR to one VNG
function connect_csr () {
csr_id=$1
gw_id=$2
cx_type=$3
gw_type=$(get_router_type_from_id "$gw_id")
# csr_asn=$(get_router_asn_from_id $csr_id) # Not used
vpngw_name=vng${gw_id}
vpngw_bgp_json=$(az network vnet-gateway show -n "$vpngw_name" -g "$rg" --query 'bgpSettings' -o json 2>/dev/null)
vpngw_asn=$(echo "$vpngw_bgp_json" | jq -r '.asn')
vpngw_gw0_pip=$(echo "$vpngw_bgp_json" | jq -r '.bgpPeeringAddresses[0].tunnelIpAddresses[0]')
vpngw_gw0_bgp_ip=$(echo "$vpngw_bgp_json" | jq -r '.bgpPeeringAddresses[0].defaultBgpIpAddresses[0]')
if [[ ${gw_type} == "vng" ]] || [[ ${gw_type} == "vng2" ]]
then
vpngw_gw1_pip=$(echo "$vpngw_bgp_json" | jq -r '.bgpPeeringAddresses[1].tunnelIpAddresses[0]')
vpngw_gw1_bgp_ip=$(echo "$vpngw_bgp_json" | jq -r '.bgpPeeringAddresses[1].defaultBgpIpAddresses[0]')
echo "Extracted info for vpngw: ASN $vpngw_asn, GW0 $vpngw_gw0_pip, $vpngw_gw0_bgp_ip. GW1 $vpngw_gw1_pip, $vpngw_gw1_bgp_ip."
elif [[ "$gw_type" == "vng1" ]]
then
echo "Extracted info for vpngw: ASN $vpngw_asn, $vpngw_gw0_pip, $vpngw_gw0_bgp_ip."
else
echo "Sorry, I do not understand the VNG type $gw_type"
fi
# Tunnels for vpngw (IKEv2)
echo "Configuring tunnels between CSR $csr_id and VPN GW $gw_id"
config_csr_tunnel "$csr_id" "${csr_id}${gw_id}0" "$vpngw_gw0_pip" "$vpngw_gw0_bgp_ip" "$(get_router_asn_from_id "$gw_id")" ikev2 "$cx_type"
if [[ ${gw_type} == "vng" ]] || [[ ${gw_type} == "vng2" ]]
then
config_csr_tunnel "$csr_id" "${csr_id}${gw_id}1" "$vpngw_gw1_pip" "$vpngw_gw1_bgp_ip" "$(get_router_asn_from_id "$gw_id")" ikev2 "$cx_type"
fi
# Connect Local GWs to VNGs
echo "Creating VPN connections in Azure..."
if [[ "$cx_type" == "nobgp" ]]
then
bgp_option=""
else
bgp_option="--enablebgp"
fi
az network vpn-connection create -n "vng${gw_id}tocsr${csr_id}" -g "$rg" --vnet-gateway1 "vng${gw_id}" \
--shared-key "$psk" --local-gateway2 "csr${csr_id}" $bgp_option >/dev/null 2>&1
if [[ -n "$gw2_id" ]]
then
az network vpn-connection create -n "vng${gw2_id}tocsr${csr_id}" -g "$rg" --vnet-gateway1 "vng${gw2_id}" \
--shared-key "$psk" --local-gateway2 "csr${csr_id}" $bgp_option >/dev/null 2>&1
fi
}
# Run "show interface ip brief" on CSR
function sh_csr_int () {
csr_id=$1
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" -o tsv --query ipAddress 2>/dev/null)
ssh -n -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" "sh ip int b" 2>/dev/null
}
# Open an interactive SSH session to a CSR
function ssh_csr () {
csr_id=$1
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" -o tsv --query ipAddress 2>/dev/null)
ssh "$csr_ip"
}
# Deploy baseline VPN and BGP config to a Cisco CSR
function config_csr_base () {
csr_id=$1
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" -o tsv --query ipAddress 2>/dev/null)
asn=$(get_router_asn_from_id "$csr_id")
myip=$(curl -s4 ifconfig.co)
# Check we have a valid IP
until [[ $myip =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]
do
sleep 5
myip=$(curl -s4 ifconfig.co)
done
echo "Our IP seems to be $myip"
default_gateway="10.${csr_id}.0.1"
echo "Configuring CSR ${csr_ip} for VPN and BGP..."
username=$(whoami)
password=$psk
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
username ${username} password 0 ${password}
username ${username} privilege 15
username ${default_username} password 0 ${password}
username ${default_username} privilege 15
no ip domain lookup
no ip ssh timeout
crypto ikev2 keyring azure-keyring
crypto ikev2 proposal azure-proposal
encryption aes-cbc-256 aes-cbc-128 3des
integrity sha1
group 2
crypto ikev2 policy azure-policy
proposal azure-proposal
crypto ikev2 profile azure-profile
match address local interface GigabitEthernet1
authentication remote pre-share
authentication local pre-share
keyring local azure-keyring
crypto ipsec transform-set azure-ipsec-proposal-set esp-aes 256 esp-sha-hmac
mode tunnel
crypto ipsec profile azure-vti
set security-association lifetime kilobytes 102400000
set transform-set azure-ipsec-proposal-set
set ikev2-profile azure-profile
crypto isakmp policy 1
encr aes
authentication pre-share
group 14
crypto ipsec transform-set csr-ts esp-aes esp-sha-hmac
mode tunnel
crypto ipsec profile csr-profile
set transform-set csr-ts
router bgp $asn
bgp router-id interface GigabitEthernet1
network 10.${csr_id}.0.0 mask 255.255.0.0
bgp log-neighbor-changes
maximum-paths eibgp 4
ip route ${myip} 255.255.255.255 ${default_gateway}
ip route 10.${csr_id}.0.0 255.255.0.0 ${default_gateway}
line vty 0 15
exec-timeout 0 0
end
wr mem
EOF
}
# Configure a tunnel a BGP neighbor for a specific remote endpoint on a Cisco CSR
# "mode" can be either IKEv2 or ISAKMP. I havent been able to bring up
# a CSR-to-CSR connection using IKEv2, hence my workaround is using isakmp.
function config_csr_tunnel () {
csr_id=$1
tunnel_id=$2
public_ip=$3
private_ip=$4
remote_asn=$5
mode=$6
cx_type=$7 # Can be none, ospf, bgpospf or empty (bgp per default)
if [[ -z "$mode" ]]
then
mode=ikev2
fi
if [[ "$mode" == "ikev2" ]]
then
ipsec_profile="azure-vti"
else
ipsec_profile="csr-profile"
fi
asn=$(get_router_asn_from_id "${csr_id}")
default_gateway="10.${csr_id}.0.1"
csr_ip=$(az network public-ip show -n "csr${csr_id}-pip" -g "$rg" -o tsv --query ipAddress)
echo "Configuring tunnel ${tunnel_id} in CSR ${csr_ip}..."
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
crypto ikev2 keyring azure-keyring
peer ${public_ip}
address ${public_ip}
pre-shared-key ${psk}
crypto ikev2 profile azure-profile
match identity remote address ${public_ip} 255.255.255.255
crypto isakmp key ${psk} address ${public_ip}
interface Tunnel${tunnel_id}
ip unnumbered GigabitEthernet1
ip tcp adjust-mss 1350
tunnel source GigabitEthernet1
tunnel mode ipsec ipv4
tunnel destination ${public_ip}
tunnel protection ipsec profile ${ipsec_profile}
ip route ${private_ip} 255.255.255.255 Tunnel${tunnel_id}
ip route ${public_ip} 255.255.255.255 ${default_gateway}
end
wr mem
EOF
if [[ -z "$cx_type" ]] || [[ "$cx_type" == "bgp" ]] || [[ "$cx_type" == "bgpospf" ]]
then
echo "Configuring BGP on tunnel ${tunnel_id} in CSR ${csr_ip}..."
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
router bgp ${asn}
neighbor ${private_ip} remote-as ${remote_asn}
neighbor ${private_ip} update-source GigabitEthernet1
end
wr mem
EOF
if [[ "$asn" == "$remote_asn" ]]
then
# iBGP
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
router bgp ${asn}
neighbor ${private_ip} next-hop-self
end
wr mem
EOF
else
# eBGP
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
router bgp ${asn}
neighbor ${private_ip} ebgp-multihop 5
end
wr mem
EOF
fi
elif [[ "$cx_type" == "ospf" ]] || [[ "$cx_type" == "bgpospf" ]]
then
echo "Configuring OSPF on tunnel ${tunnel_id} in CSR ${csr_ip}..."
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
router ospf 100
no passive-interface Tunnel${tunnel_id}
network 10.${csr_id}.0.0 255.255.0.0 area 0
end
wr mem
EOF
elif [[ "$cx_type" == "static" ]] ## Not used
then
echo "Configuring static routes for tunnel ${tunnel_id} in CSR ${csr_ip}..."
remote_id=$(echo "$tunnel_id" | head -c 2 | tail -c 1) # This only works with a max of 9 routers
echo "Configuring OSPF on tunnel ${tunnel_id} in CSR ${csr_ip}..."
ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$csr_ip" >/dev/null 2>&1 <<EOF
config t
ip route 10.${remote_id}.0.0 255.255.0.0 Tunnel${tunnel_id}
end
wr mem
EOF
else
echo "No routing protocol configured on ${tunnel_id} in CSR ${csr_ip}..."
fi
}
# Connect two CSRs to each other over IPsec and BGP
function connect_csrs () {
csr1_id=$1
csr2_id=$2
cx_type=$3
csr1_ip=$(az network public-ip show -n "csr${csr1_id}-pip" -g "$rg" -o tsv --query ipAddress)
csr2_ip=$(az network public-ip show -n "csr${csr2_id}-pip" -g "$rg" -o tsv --query ipAddress)
csr1_asn=$(get_router_asn_from_id "${csr1_id}")
csr2_asn=$(get_router_asn_from_id "${csr2_id}")
csr1_bgp_ip="10.${csr1_id}.0.10"
csr2_bgp_ip="10.${csr2_id}.0.10"
# Tunnel from csr1 to csr2 (using ISAKMP instead of IKEv2)
tunnel_id=${csr1_id}${csr2_id}
config_csr_tunnel "$csr1_id" "$tunnel_id" "$csr2_ip" "$csr2_bgp_ip" "$csr2_asn" isakmp "$cx_type"
# Tunnel from csr2 to csr1 (using ISAKMP instead of IKEv2)
tunnel_id=${csr2_id}${csr1_id}
config_csr_tunnel "$csr2_id" "$tunnel_id" "$csr1_ip" "$csr1_bgp_ip" "$csr1_asn" isakmp "$cx_type"
}
# Configure logging
function init_log () {
logws_name=$(az monitor log-analytics workspace list -g "$rg" --query '[0].name' -o tsv 2>/dev/null)
if [[ -z "$logws_name" ]]
then
logws_name=log$RANDOM
echo "Creating LA workspace $logws_name..."
az monitor log-analytics workspace create -n $logws_name -g "$rg" >/dev/null 2>/dev/null
else
echo "Found log analytics workspace $logws_name"
fi
logws_id=$(az resource list -g "$rg" -n "$logws_name" --query '[].id' -o tsv)
logws_customerid=$(az monitor log-analytics workspace show -n "$logws_name" -g "$rg" --query customerId -o tsv)
}
# Configures a certain VNG for logging to a previously created LA workspace
function log_gw () {
gw_id=$1
vpngw_id=$(az network vnet-gateway show -n "vng${gw_id}" -g "$rg" --query id -o tsv)
echo "Configuring diagnostic settings for gateway vng${gw_id}"
az monitor diagnostic-settings create -n mydiag --resource "$vpngw_id" --workspace "$logws_id" \
--metrics '[{"category": "AllMetrics", "enabled": true, "retentionPolicy": {"days": 0, "enabled": false }, "timeGrain": null}]' \
--logs '[{"category": "GatewayDiagnosticLog", "enabled": true, "retentionPolicy": {"days": 0, "enabled": false}},
{"category": "TunnelDiagnosticLog", "enabled": true, "retentionPolicy": {"days": 0, "enabled": false}},
{"category": "RouteDiagnosticLog", "enabled": true, "retentionPolicy": {"days": 0, "enabled": false}},
{"category": "IKEDiagnosticLog", "enabled": true, "retentionPolicy": {"days": 0, "enabled": false}}]' >/dev/null
}
# Gets IKE logs from Log Analytics
# Possible improvements:
# - Supply time and max number of msgs as parameters
function get_ike_logs () {
query='AzureDiagnostics
| where ResourceType == "VIRTUALNETWORKGATEWAYS"
| where Category == "IKEDiagnosticLog"
| where TimeGenerated >= ago(5m)
| project Message
| take 20'
az monitor log-analytics query -w "$logws_customerid" --analytics-query "$query" -o tsv
}
# Creates a connection between two routers
# The function to call depends on whether they are CSRs or VNGs
function create_connection () {
# Split router_params, different syntax for BASH and ZSH
if [ -n "$BASH_VERSION" ]; then
arr_opt=a
elif [ -n "$ZSH_VERSION" ]; then
arr_opt=A
fi
IFS=':' read -r"$arr_opt" router_params <<< "$1"
if [ -n "$BASH_VERSION" ]; then
router1_id="${router_params[0]}"
router2_id="${router_params[1]}"
cx_type="${router_params[2]}"
elif [ -n "$ZSH_VERSION" ]; then
router1_id="${router_params[1]}"
router2_id="${router_params[2]}"
cx_type="${router_params[3]}"
else
echo "Error identifying shell, it looks like neither BASH or ZSH!"
fi
router1_type=$(get_router_type_from_id "$router1_id")
router2_type=$(get_router_type_from_id "$router2_id")
echo "Creating connection between ${router1_type} ${router1_id} and ${router2_type} ${router2_id}, type \"${cx_type}\"..."
if [[ "$router1_type" == "vng" ]] || [[ "$router1_type" == "vng1" ]] || [[ "$router1_type" == "vng2" ]]
then
# VNG-to-VNG
if [[ "$router2_type" == "vng" ]] || [[ "$router2_type" == "vng1" ]] || [[ "$router2_type" == "vng2" ]]
then
connect_gws "$router1_id" "$router2_id" "$cx_type"
# VNG-to-CSR
else
connect_csr "$router2_id" "$router1_id" "$cx_type"
fi
else
# CSR-to-VNG
if [[ "$router2_type" == "vng" ]] || [[ "$router2_type" == "vng1" ]] || [[ "$router2_type" == "vng2" ]]
then
connect_csr "$router1_id" "$router2_id" "$cx_type"
# CSR-to-CSR
else
connect_csrs "$router1_id" "$router2_id" "$cx_type"
fi
fi
}
# Get router type for a specific router ID
function get_router_type_from_id () {
id=$1
for router in "${routers[@]}"
do
this_id=$(get_router_id "$router")
if [[ "$id" -eq "$this_id" ]]
then
get_router_type "$router"
fi
done
}
# Get router ASN for a specific router ID
function get_router_asn_from_id () {
id=$1
for router in "${routers[@]}"
do
this_id=$(get_router_id "$router")
if [[ "$id" -eq "$this_id" ]]
then
get_router_asn "$router"
fi
done
}
# Verifies a VNG or CSR has been created in Azure
function verify_router () {
router=$1
echo "Verifying $router..."
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "csr" ]]
then
vm_status=$(az vm show -n "csr${id}-nva" -g "$rg" --query provisioningState -o tsv)
ip=$(az network public-ip show -n "csr${id}-pip" -g "$rg" --query ipAddress -o tsv)
echo "VM csr${id}-nva status is ${vm_status}, public IP is ${ip}"
else
gw_status=$(az network vnet-gateway show -n "vng${id}" -g "$rg" --query provisioningState -o tsv)
# ip_a=$(az network public-ip show -n "vng${id}a" -g "$rg" --query ipAddress -o tsv)
# ip_b=$(az network public-ip show -n "vng${id}b" -g "$rg" --query ipAddress -o tsv)
# echo "Gateway vng${id} status is ${gw_status}, public IPs are ${ip_a} and ${ip_b}"
echo "Gateway vng${id} status is ${gw_status}"
fi
}
# Showing BGP neighbors for a certain router
function show_bgp_neighbors () {
router=$1
echo "Getting BGP neighbors for router $router..."
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "csr" ]]
then
ip=$(az network public-ip show -n "csr${id}-pip" -g "$rg" --query ipAddress -o tsv)
neighbors=$(ssh -n -o BatchMode=yes -o StrictHostKeyChecking=no -o KexAlgorithms=+diffie-hellman-group14-sha1 "$ip" "show ip bgp summary | begin Neighbor" 2>/dev/null)
echo "BGP neighbors for csr${id}-nva (${ip}):"
clean_string "$neighbors"
else
neighbors=$(az network vnet-gateway list-bgp-peer-status -n "vng${id}" -g "$rg" -o table 2>/dev/null)
echo "BGP neighbors for vng${id}:"
echo "$neighbors"
fi
}
# Create a VNG or a CSR, configuration given by a colon-separated parameter string (like "1:vng:65515")
function create_router () {
type=$(get_router_type "$router")
id=$(get_router_id "$router")
asn=$(get_router_asn "$router")
echo "Creating router of type $type, id $id, ASN $asn..."
case $type in
"vng"|"vng1"|"vng2")
create_vng "$id" "$asn"
;;
"csr")
create_csr "$id"
;;
esac
}
# Gets the type out of a router configuration (like csr in "1:csr:65515")
function get_router_type () {
# Split router_params, different syntax for BASH and ZSH
if [ -n "$BASH_VERSION" ]; then
arr_opt=a
elif [ -n "$ZSH_VERSION" ]; then
arr_opt=A
fi
IFS=':' read -r"$arr_opt" router_params <<< "$1"
# In BASH array indexes start with 0, in ZSH with 1
if [ -n "$BASH_VERSION" ]; then
echo "${router_params[1]}"
elif [ -n "$ZSH_VERSION" ]; then
echo "${router_params[2]}"
fi
}
# Gets the ID out of a router configuration (like 1 in "1:csr:65515")
function get_router_id () {
# Split router_params, different syntax for BASH and ZSH
if [ -n "$BASH_VERSION" ]; then
arr_opt=a
elif [ -n "$ZSH_VERSION" ]; then
arr_opt=A
fi
IFS=':' read -r"$arr_opt" router_params <<< "$1"
# In BASH array indexes start with 0, in ZSH with 1
if [ -n "$BASH_VERSION" ]; then
echo "${router_params[0]}"
elif [ -n "$ZSH_VERSION" ]; then
echo "${router_params[1]}"
fi
}
# Gets the ASN out of a router configuration (like 65001 in "1:csr:65001")
function get_router_asn () {
# Split router_params, different syntax for BASH and ZSH
if [ -n "$BASH_VERSION" ]; then
arr_opt=a
elif [ -n "$ZSH_VERSION" ]; then
arr_opt=A
fi
IFS=':' read -r"$arr_opt" router_params <<< "$1"
# In BASH array indexes start with 0, in ZSH with 1
if [ -n "$BASH_VERSION" ]; then
echo "${router_params[2]}"
elif [ -n "$ZSH_VERSION" ]; then
echo "${router_params[3]}"
fi
}
# Wait until all VNGs in the router list finish provisioning
function wait_for_gws_finished () {
for router in "${routers[@]}"
do
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "vng" ]] || [[ "$type" == "vng1" ]] || [[ "$type" == "vng2" ]]
then
vng_name=vng${id}
vpngw_id=$(az network vnet-gateway show -n "$vng_name" -g "$rg" --query id -o tsv 2>/dev/null)
wait_until_finished "$vpngw_id"
fi
done
}
# Configure logging to LA for all gateways
function config_gw_logging () {
for router in "${routers[@]}"
do
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "vng" ]] || [[ "$type" == "vng1" ]] || [[ "$type" == "vng2" ]]
then
log_gw "$id"
fi
done
}
# Deploy base config for all CSRs
function config_csrs_base () {
for router in "${routers[@]}"
do
type=$(get_router_type "$router")
id=$(get_router_id "$router")
if [[ "$type" == "csr" ]]
then
config_csr_base "$id"
create_vm_in_csr_vnet "$id"
fi
done
}
# Add an additional users to each test VM
function add_users_to_vms () {
vm_list=$(az vm list -o tsv -g "$rg" --query "[?contains(name,'testvm')].name")
while IFS= read -r vm_name; do
az vm user update -g $rg -u "$default_username" -p "$psk" -n "$vm_name"
done <<< "$vm_list"
}
# Converts a CSV list to a shell array
function convert_csv_to_array () {
if [ -n "$BASH_VERSION" ]; then
arr_opt=a
elif [ -n "$ZSH_VERSION" ]; then
arr_opt=A
fi
IFS=',' read -r"${arr_opt}" myarray <<< "$1"
echo "${myarray[@]}"
}
# Checks that the PSK complies with password rules for VMs
# Returns a message if the password is not compliant with pasword rules, returns nothing if it is
function check_password () {
password_to_check=$1
password_to_check_len=${#password_to_check}
# Length
if [ "$password_to_check_len" -lt 12 ]; then
echo "$password_to_check is shorter than 12 characters"
else
# Special characters
if [[ -z $(echo "$password_to_check" | tr -d "[:alnum:]") ]]; then
echo "$password_to_check does not contain non alphanumeric characters"
else
# Numbers
if [[ -z $(echo "$password_to_check" | tr -cd "0-9") ]]; then
echo "$password_to_check does not contain numbers"
else
# Lower case
if [[ -z $(echo "$password_to_check" | tr -cd "a-z") ]]; then
echo "$password_to_check does not contain lower case characters"
else
# Upper case
if [[ -z $(echo "$password_to_check" | tr -cd "A-Z") ]]; then
echo "$password_to_check does not contain upper case characters"
fi
fi
fi
fi
fi
}
# Verify certain things:
# - Presence of required binaries
# - Presence of requirec az extensions
# - Azure CLI logged in
function perform_system_checks () {
# Verify software dependencies
for binary in "ssh" "jq" "az" "awk"
do
binary_path=$(which "$binary")
if [[ -z "$binary_path" ]]
then
echo "It seems that $binary is not installed in the system. Please install it before trying this script again"
exit
fi
done
echo "All dependencies checked successfully"
# Verify az is logged in
subscription_name=$(az account show --query name -o tsv 2>/dev/null)
if [[ -z "$subscription_name" ]]
then
echo "It seems you are not logged into Azure with the Azure CLI. Please use \"az login\" before trying this script again"
exit
fi
# Verify required az extensions installed