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You can use CLI-suite to use Network Access Control Lists (Network ACL) to block and unblock IP-addresses or IP-ranges. |
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Using Network Access Control Lists works not for environments which have a Content Delivery Network e.g. CDN (Amazon CloudFront) or Cloudflare in place. |
Preconditions
You need access to jumphost with you personal Openssh access key. Access an environment via OpenSSH
General usage instructions
You can use CLI-suite to use Network Access Control Lists (Network ACL) to block and unblock IP-addresses or IP-ranges.
Network ACL are one of multiple security measures applied to your infrastructure. They control traffic flow on network layer and allow the application of restrictions to this traffic. Overall there are multiple Network ACLs for each environment. However the one of most concern is the one controlling the traffic flow from the Internet to the infrastructure. This also, is the only one you are allowed to make changes to e.g. by blocking or unblocking IPs or IP-Ranges.
The general usage instructions for the CLI-suite r3 can be found at CLI-Suite (root360) .
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IP vs CIDR A Network ACL is based on IPs or IP ranges presented in the Classless Inter-Domain Routing (CIDR) notation (having /xx behind the actual IP to describe network mask). |
List currently applied ACL
r3 net list --network-aclshows the whole Network ACL for the public network segment of your infrastructureThe overview includes
the name/identifier of the ACL
a number assigned to the respective entry in the ACL (order is important to evalute deny before allow actions)
the column Ingress describes the direction of the traffic flow. Ingress=True describes a rule is applied to incomming traffic, whilst the opposite indicates rules for traffic leaving your infrastructure
CIDRBlock is the actual IP or IP range of consideration
The protocol number (following IANA Internet Protocol Numbers Standards) names the network protocol of considerations (e.g. 6 for TCP Traffic)
PortRange specifies the port or port range the rule applies to
The RuleAction specifies how to handle the traffic e.g. deny it or allow it
This examples shows:
the default rule set for the Network ACL root360 GmbH is rolling out
4 block rules (RuleAction = deny, RuleNumbers 996-999) for 2 separate IPs covering incomming traffic for all ports. Thus these rules block HTTP and HTTPS requests for the given IPs including all other connections.
List currently applied ACL example
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~$ r3 net list --network-aclCompany: root360, Project: backend, Environment: test Company: root360 +--------------+------------+---------+------------------+----------+--------------+------------+ | NetworkAclId | RuleNumber | Ingress | CidrBlock | Protocol | PortRange | RuleAction | +--------------+------------+---------+------------------+----------+--------------+------------+ | acl-2778c94e | 100 | False | 0.0.0.0/0 | 6 | 0 - 65535 | allow | | acl-2778c94e | 996 | True | 35.156.218.92/32 | 6 | 443 - 443 | deny | | acl-2778c94e | 997 | True | 35.156.218.92/32 | 6 | 80 - 80 | deny | | acl-2778c94e | 998 | True | 35.156.218.91/32 | 6 | 443 - 443 | deny | | acl-2778c94e | 999 | True | 35.156.218.91/32 | 6 | 80 - 80 | deny | | acl-2778c94e | 1000 | True | 0.0.0.0/0 | 6 | 80 - 80 | allow | | acl-2778c94e | 1100 | True | 0.0.0.0/0 | 6 | 443 - 443 | allow | | acl-2778c94e | 1300 | True | 10.0.56.0/27 | 6 | 1024 - 65535 | allow | | acl-2778c94e | 1400 | True | 10.0.57.0/24 | 6 | 1024 - 65535 | allow | | acl-2778c94e | 1500 | True | 10.0.58.0/24 | 6 | 1024 - 65535 | allow | | acl-2778c94e | 32767 | False | 0.0.0.0/0 | -1 | ALL | deny | | acl-2778c94e | 32767 | True | 0.0.0.0/0 | -1 | ALL | deny | | acl-2778c94e | 32768 | False | ::/0 | -1 | ALL | deny | | acl-2778c94e | 32768 | True | ::/0 | -1 | ALL | deny | +--------------+------------+---------+------------------+----------+--------------+------------+ |
Blocking an IP-address
Use the command lines
r3 net blockto block an IP or IP ranges HTTP(S) traffic.You can only block exactly one IP or IP range at a time.
You can block by giving just the IP or the IP plus respective CIDR.
The return shows you the result of the operation.
Blocking example
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~$ r3 net block 35.156.218.93 # Response ProjectCompany: backendroot360, CompanyProject: root360backend, Environment: test +------------------+---------+----------------+ | IP/CIDR | Port | Block Response | +------------------+---------+----------------+ | 35.156.218.93/32 | 80 | success (200) | | 35.156.218.93/32 | 443 | success (200) | +------------------+---------+----------------+ |
Unblocking an IP-address
Use the command lines
r3 net unblockto unblock HTTP(S) traffic for an IP or IP range (e.g. because it was blocked before).You can only unblock exactly one IP or IP range at a time
You can unblock by giving just the IP or the IP plus respective CIDR
The return shows you the IP or IP range you entered, the Network-ACLs modified and the result of the operation
Unblocking example
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~$ r3 net unblock 35.156.218.93/32 # Response Company: root360, Environment: test, Project: backend Company: root360 +------------------+--------------+------------------+ | IP/CIDR | ACL | UnBlock Response | +------------------+--------------+------------------+ | 35.156.218.93/32 | acl-2778c94e | success (200) | +------------------+--------------+------------------+ |
Limitations
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You will be prevented to block/unblock
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