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terraform-aws-tor-bridge

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SR2 Communications Limited

README Header

Deploy obfs4 public Tor bridges to AWS EC2.


It's 100% Open Source and licensed under the BSD 2-clause License.

Usage

module "bridge" {
  source          = "sr2c/tor-bridge/aws"
  # TODO: version = "x.x.x"
  count           = 1 # increase for more bridges
  namespace       = "<yourorg>"
  name            = "bridge"
  attributes      = [tostring(count.index)]
  ssh_public_key  = var.ssh_public_key
  ssh_private_key = var.ssh_private_key
  contact_info    = "<admin email address>"
}

Requirements

Name Version
terraform >= 1.0.11
aws >= 4.2.0
null >= 3.2.1
random >= 3.1.0

Providers

Name Version
aws >= 4.2.0
null >= 3.2.1
random >= 3.1.0

Modules

Name Source Version
bridgeline matti/resource/shell 1.5.0
cloudinit sr2c/tor/cloudinit 0.2.4
fingerprint_ed25519 matti/resource/shell 1.5.0
fingerprint_rsa matti/resource/shell 1.5.0
hashed_fingerprint matti/resource/shell 1.5.0
instance cloudposse/ec2-instance/aws 0.45.2
this cloudposse/label/null 0.25.0
torrc sr2c/torrc/null 0.0.4

Resources

Name Type
aws_key_pair.this resource
aws_security_group.obfs4 resource
aws_security_group_rule.obfs4 resource
null_resource.wait_for_cloud_init resource
random_integer.obfs_port resource
random_integer.or_port resource
aws_ami.debian data source
aws_availability_zones.available data source
aws_subnet.default data source
aws_vpc.default data source

Inputs

Name Description Type Default Required
ami ID of an alternative AMI to use for the EC2 instance. The latest Debian 11 AMI will be used if left unset. string null no
ami_owner The owner ID of the AMI. The Debian organisation's ID will be used if left unset. string null no
contact_info Contact information to be published in the bridge descriptor. string n/a yes
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 be
identical to how they appear in id.
Default is {} (descriptors output will be empty).
any {} no
distribution_method Bridge distribution method string "any" no
instance_type EC2 instance size. string "t3.small" no
ssh_private_key Filename of private SSH key for provisioning. string n/a yes
ssh_public_key Filename of public SSH key for provisioning. string n/a yes
ssh_user Username to use for SSH access (must have password-less sudo enabled). string "admin" no

Label Inputs

This Terraform module makes use of the cloudposse/label/null module to generate consistent names and tags for resources. The label module contains many inputs that are common across all our modules that use the label module, and so these inputs have been seperated here to make it clearer which inputs are specific to this module.

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
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
{
"additional_tag_map": {},
"attributes": [],
"delimiter": null,
"descriptor_formats": {},
"enabled": true,
"environment": null,
"id_length_limit": null,
"label_key_case": null,
"label_order": [],
"label_value_case": null,
"labels_as_tags": [
"unset"
],
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {},
"tenant": null
}
no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.
string null 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
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 be
changed in later chained modules. Attempts to change it will be silently ignored.
set(string)
[
"default"
]
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

Outputs

Name Description
ansible_inventory An Ansible inventory line that allows login to the bridge with the correct username.
bridgeline The bridgeline that would allow a Tor client to use this bridge.
fingerprint_ed25519 The Ed25519 fingerprint of this bridge.
fingerprint_rsa The hex-encoded RSA fingerprint of this bridge.
hashed_fingerprint The hex-encoded hashed fingerprint of this bridge. This is used to identify the bridge in public Tor Metrics data.
id An identifier for the bridge formed of the ID elements.
ip_address The IP address of the server. This is treated as sensitive as this information may be used to censor access to the bridge.
nickname The nickname of the bridge published in the bridge descriptors. This is based on the ID, reformatted for the nickname restrictions.
obfs_port The TCP port number used for the obfs4 port. This is treated as sensitive as this information may be used to censor access to the bridge.
or_port The TCP port number used for the OR port. This is treated as sensitive as this information may be used to censor access to the bridge.
ssh_user The username used for SSH access.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Share the Love

Like this project? Please give it a ★ on our GitLab! (it helps us a lot)## Related Projects

Check out these related projects.

  • terraform-null-torrc - Terraform module used in this module to create the torrc configuration file.
  • terraform-null-contactinfo - Terraform module that can be used to create a Tor ContactInfo-Information-Sharing-Speicifcation compliant contact info string.
  • terraform-null-label - Terraform module designed to generate consistent names and tags for resources. Use terraform-null-label to implement a strict naming convention.

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Contributing

Bug Reports & Feature Requests

Please use the issue tracker to report any bugs or file feature requests.

Developing

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  5. Submit a Merge Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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Copyright

Copyright © 2021-2024 SR2 Communications Limited

License

License: BSD 2-clause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

About

This project is maintained by SR2 Communications Limited.

SR2 Communications Limited

We're a DevOps services company based in Aberdeen, Scotland. We specialise in solutions for online freedom, digital sovereignty and anti-censorship.

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Check out our other projects, or hire us to get support with using our projects.

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