Terraform module to deploy Bypass Censorship Enterprise Onion Toolkit instances in AWS.
This module supports creating multiple EC2 instances, each serving the same selection of onion services. Due to the way that onion services are published, this provides basic load balancing and failover, although there is no direct coordination between the EOTK instances.
Each EC2 instance is deployed to a separate availability zone (up to a maximum number of the number of available availability zones within the region).
The nginx reverse proxy server configured by EOTK on each instance will keep access logs and these will be rotated hourly. On rotation, the logs will be copied to an S3 bucket for processing by an analytics system.
Rather than replace the EC2 instance on every update, which would be difficult given that EOTK builds tor and OpenResty from source as part of the installation process (time consuming), a script is installed to reconfigure EOTK every 25 minutes with any updated configuration bundle uploaded to the S3 bucket. The EC2 instances should still be considered “disposable” however, as new AMIs will cause EC2 instance replacement.
Before the module may be used, a zip file containing the EOTK configuration and the necessary Onion and TLS keys
and certificates must be created. This may be done with
archive_file or
with a tool like deterministic-zip if it is acceptable to have
a non-Terraform solution for that part. No directory structure is used within the zip file, it has only a flat
structure. To begin, create a file named sites.conf
that contains your EOTK configuration, for example:
set log_separate 1
set nginx_resolver 127.0.0.53 ipv6=off # The EC2 instance will have systemd-resolved
set nginx_cache_seconds 60 # Handle bursts, but don't cache anything too long
set nginx_cache_size 64m
set nginx_tmpfile_size 8m
set x_from_onion_value 1
foreignmap facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion facebook.com
foreignmap twitter3e4tixl4xyajtrzo62zg5vztmjuricljdp2c5kshju4avyoid.onion twitter.com
set project sites
hardmap systems3hwkxej5nzmo6kvwgx6sik2plqe4w3lsqglr6xhvyi2xlsmqd test.sr2.uk
For each onion service, you’ll need to include 4 more files in the zip file:
<onion address without .onion>.v3sec.key
- Onion secret key<onion address without .onion>.v3pub.key
- Onion public key<first 20 characters of onion address>-v3.pem
- TLS private key (PEM encoded)<first 20 characters of onion address>-v3.cert
- TLS certificate (PEM encoded)For the example given above, these files would be named:
systems3hwkxej5nzmo6kvwgx6sik2plqe4w3lsqglr6xhvyi2xlsmqd.v3sec.key
- Onion secret keysystems3hwkxej5nzmo6kvwgx6sik2plqe4w3lsqglr6xhvyi2xlsmqd.v3pub.key
- Onion public keysystems3hwkxej5nzmo6-v3.cert
- TLS private key (PEM encoded)systems3hwkxej5nzmo6-v3.pem
- TLS certificate (PEM encoded)You can then use the module to create EC2 instances and other resources to run EOTK and serve the onion site:
module "eotk" {
source = "sr2c/bc-eotk/aws"
namespace = "eg"
name = "bc-eotk"
instance_count = 1
configuration_bundle = "configuration.zip"
}
Name | Version |
---|---|
terraform | >= 1.3.0 |
aws | >= 4.4.0 |
cloudinit | >= 2.2.0 |
Name | Version |
---|---|
aws | 4.40.0 |
cloudinit | 2.2.0 |
Name | Source | Version |
---|---|---|
conf_log | sr2c/ec2-conf-log/aws | 0.0.2 |
instance | cloudposse/ec2-instance/aws | 0.45.0 |
this | cloudposse/label/null | 0.25.0 |
Name | Type |
---|---|
aws_s3_object.configuration_bundle | resource |
aws_ami.ubuntu | data source |
aws_availability_zones.available | data source |
aws_subnet.default | data source |
aws_vpc.default | data source |
cloudinit_config.this | data source |
Name | Description | Type | Default | Required |
---|---|---|---|---|
additional_tag_map | Additional key-value pairs to add to each map in tags_as_list_of_maps . Not added to tags or id .This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration. | map(string) | {} | no |
attributes | ID element. Additional attributes (e.g. workers or cluster ) to add to id ,in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the delimiter and treated as a single ID element. | list(string) | [] | no |
configuration_bundle | Path to the zip file that contains the configuration bundle to be uploaded to the configuration bucket. | string | n/a | yes |
context | Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as null to use default value.Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged. | any | { | no |
delimiter | Delimiter to be used between ID elements. Defaults to - (hyphen). Set to "" to use no delimiter at all. | string | null | no |
descriptor_formats | Describe additional descriptors to be output in the descriptors output map.Map of maps. Keys are names of descriptors. Values are maps of the form {<br> format = string<br> labels = list(string)<br>} (Type is any so the map values can later be enhanced to provide additional options.)format is a Terraform format string to be passed to the format() function.labels is a list of labels, in order, to pass to format() function.Label values will be normalized before being passed to format() so they will beidentical to how they appear in id .Default is {} (descriptors output will be empty). | any | {} | no |
enabled | Set to false to prevent the module from creating any resources | bool | null | no |
environment | ID element. Usually used for region e.g. ‘uw2’, ‘us-west-2’, OR role ‘prod’, ‘staging’, ‘dev’, ‘UAT’ | string | null | no |
id_length_limit | Limit id to this many characters (minimum 6).Set to 0 for unlimited length.Set to null for keep the existing setting, which defaults to 0 .Does not affect id_full . | number | null | no |
instance_count | Number of EC2 instances to create. If the number specified is more than the number of available availability zones, the number of instances will be capped to the number of available availability zones. If the number is zero then no instances will be created. | number | 2 | no |
label_key_case | Controls the letter case of the tags keys (label names) for tags generated by this module.Does not affect keys of tags passed in via the tags input.Possible values: lower , title , upper .Default value: title . | string | null | no |
label_order | The order in which the labels (ID elements) appear in the id .Defaults to [“namespace”, “environment”, “stage”, “name”, “attributes”]. You can omit any of the 6 labels (“tenant” is the 6th), but at least one must be present. | list(string) | null | no |
label_value_case | Controls the letter case of ID elements (labels) as included in id ,set as tag values, and output by this module individually. Does not affect values of tags passed in via the tags input.Possible values: lower , title , upper and none (no transformation).Set this to title and set delimiter to "" to yield Pascal Case IDs.Default value: lower . | string | null | no |
labels_as_tags | Set of labels (ID elements) to include as tags in the tags output.Default is to include all labels. Tags with empty values will not be included in the tags output.Set to [] to suppress all generated tags.Notes: The value of the name tag, if included, will be the id , not the name .Unlike other null-label inputs, the initial setting of labels_as_tags cannot bechanged in later chained modules. Attempts to change it will be silently ignored. | set(string) | [ | no |
name | ID element. Usually the component or solution name, e.g. ‘app’ or ‘jenkins’. This is the only ID element not also included as a tag .The “name” tag is set to the full id string. There is no tag with the value of the name input. | string | null | no |
namespace | ID element. Usually an abbreviation of your organization name, e.g. ’eg’ or ‘cp’, to help ensure generated IDs are globally unique | string | null | no |
regex_replace_chars | Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits. | string | null | no |
stage | ID element. Usually used to indicate role, e.g. ‘prod’, ‘staging’, ‘source’, ‘build’, ’test’, ‘deploy’, ‘release’ | string | null | no |
tags | Additional tags (e.g. {'BusinessUnit': 'XYZ'} ).Neither the tag keys nor the tag values will be modified by this module. | map(string) | {} | no |
tenant | ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for | string | null | no |
Name | Description |
---|---|
instances | An object mapping the availability zone in use to the instance ID for the created EC2 instance running EOTK in that availability zone. |
log_bucket_arn | The ARN of the log bucket created to hold the nginx access logs. |
log_bucket_id | The ID of the log bucket created to hold the nginx access logs. |