├── .circleci └── config.yml ├── .fossa.yml ├── .github └── ISSUE_TEMPLATE │ ├── bug_report.md │ └── feature_request.md ├── .gitignore ├── .goreleaser.yml ├── LICENSE ├── README.md ├── examples └── spot-bastion │ ├── README.md │ ├── data.tf │ ├── ec2.tf │ ├── locals.tf │ ├── outputs.tf │ ├── sg.tf │ └── variables.tf ├── go.mod ├── go.sum ├── main.go └── pkg ├── sshutils ├── connect.go ├── ec2endpoint.go ├── endpoint.go └── keys.go └── update └── update.go /.circleci/config.yml: -------------------------------------------------------------------------------- 1 | version: 2.1 2 | workflows: 3 | main: 4 | jobs: 5 | - release: 6 | # Only run this job on git tag pushes 7 | filters: 8 | branches: 9 | ignore: /.*/ 10 | tags: 11 | only: /[0-9]+(\.[0-9]+)*(-.*)*/ 12 | jobs: 13 | release: 14 | docker: 15 | - image: circleci/golang:1.16 16 | steps: 17 | - checkout 18 | - run: curl -sL https://git.io/goreleaser | bash 19 | -------------------------------------------------------------------------------- /.fossa.yml: -------------------------------------------------------------------------------- 1 | # Generated by FOSSA CLI (https://github.com/fossas/fossa-cli) 2 | # Visit https://fossa.com to learn more 3 | 4 | version: 2 5 | cli: 6 | server: https://app.fossa.com 7 | fetcher: custom 8 | project: https://github.com/nodefortytwo/amz-ssh.git 9 | analyze: 10 | modules: 11 | - name: github.com/nodefortytwo/amz-ssh 12 | type: go 13 | target: github.com/nodefortytwo/amz-ssh 14 | path: . 15 | -------------------------------------------------------------------------------- /.github/ISSUE_TEMPLATE/bug_report.md: -------------------------------------------------------------------------------- 1 | --- 2 | name: Bug report 3 | about: Create a report to help us improve 4 | title: '' 5 | labels: '' 6 | assignees: '' 7 | 8 | --- 9 | 10 | **Describe the bug** 11 | A clear and concise description of what the bug is. 12 | 13 | **To Reproduce** 14 | Steps to reproduce the behavior: 15 | 1. Go to '...' 16 | 2. Click on '....' 17 | 3. Scroll down to '....' 18 | 4. See error 19 | 20 | **Expected behavior** 21 | A clear and concise description of what you expected to happen. 22 | 23 | **Screenshots** 24 | If applicable, add screenshots to help explain your problem. 25 | 26 | **Desktop (please complete the following information):** 27 | - OS: [e.g. iOS] 28 | - Browser [e.g. chrome, safari] 29 | - Version [e.g. 22] 30 | 31 | **Smartphone (please complete the following information):** 32 | - Device: [e.g. iPhone6] 33 | - OS: [e.g. iOS8.1] 34 | - Browser [e.g. stock browser, safari] 35 | - Version [e.g. 22] 36 | 37 | **Additional context** 38 | Add any other context about the problem here. 39 | -------------------------------------------------------------------------------- /.github/ISSUE_TEMPLATE/feature_request.md: -------------------------------------------------------------------------------- 1 | --- 2 | name: Feature request 3 | about: Suggest an idea for this project 4 | title: '' 5 | labels: '' 6 | assignees: '' 7 | 8 | --- 9 | 10 | **Is your feature request related to a problem? Please describe.** 11 | A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] 12 | 13 | **Describe the solution you'd like** 14 | A clear and concise description of what you want to happen. 15 | 16 | **Describe alternatives you've considered** 17 | A clear and concise description of any alternative solutions or features you've considered. 18 | 19 | **Additional context** 20 | Add any other context or screenshots about the feature request here. 21 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | -------------------------------------------------------------------------------- /.goreleaser.yml: -------------------------------------------------------------------------------- 1 | # This is an example goreleaser.yaml file with some sane defaults. 2 | # Make sure to check the documentation at http://goreleaser.com 3 | before: 4 | hooks: 5 | # you may remove this if you don't use vgo 6 | - go mod tidy 7 | builds: 8 | - id: amz-ssh 9 | env: 10 | - CGO_ENABLED=0 11 | ldflags: 12 | - -s -w -X main.version={{.Version}} 13 | checksum: 14 | name_template: 'checksums.txt' 15 | snapshot: 16 | name_template: "{{ .Tag }}-next" 17 | release: 18 | prerelease: auto 19 | changelog: 20 | sort: asc 21 | filters: 22 | exclude: 23 | - '^docs:' 24 | - '^test:' 25 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # amz-ssh 2 | 3 | a tool that replaces aws/aws-ec2-instance-connect-cli. 4 | 5 | ## Advantages 6 | 7 | - Keys generated in memory and never stored to disk 8 | - Native golang, no ssh exec 9 | - Detects instance details based on tags, via spot requests 10 | - supports tunneling 11 | 12 | ## Getting Started 13 | 14 | In aws launch a bastion server compatible with EC2 Instance Connect either via spot request or standard on demand. by default 15 | `amz-ssh` looks for requests / instances tagged with `role:bastion`. The instance must be 16 | accessible to your network, usually this mean has a public ip. 17 | 18 | see [EC2 Instance Connect docs](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-methods.html) for more information 19 | 20 | see this [simple Terraform bastion example](./examples/spot-bastion) 21 | 22 | ## How to use 23 | 24 | `amz-ssh` is designed to be run in an already authenticated environment eg via [aws-vault](https://github.com/99designs/aws-vault) or with default credentials, it does not, and will never, support assuming roles internally. 25 | 26 | Connect to a bastion / jump host launched by a spot request with a tag `role:bastion` 27 | 28 | `amz-ssh` 29 | 30 | Connect to a specific instance (ignoring tags etc) 31 | 32 | `amz-ssh -i i-0eaa4d1c7f350216e` 33 | 34 | Connect to a bastion with the tag `job:bastion-special` 35 | 36 | `amz-ssh --tag job:bastion-special` 37 | 38 | Tunnel through the default bastion 39 | 40 | `amz-ssh -t somedatabase.example.com:5432` 41 | 42 | Tunnel to a host through a specific instance 43 | 44 | `amz-ssh -i i-0eaa4d1c7f350216e -t somedatabase.example.com:5432` 45 | 46 | SSH to another host via the bastion 47 | 48 | `amz-ssh -d i-0eaa4d1c7f350216e` 49 | 50 | You can add as many `-d` flags as you want to continue chaining connections 51 | 52 | `amz-ssh -d i-0eaa4d1c7f350216e -d i-0eaa4d1c7f67546e` 53 | 54 | Specify the username and port 55 | 56 | `amz-ssh -d ubuntu@i-0eaa4d1c7f350216e:2222` 57 | 58 | ## Manual 59 | 60 | ``` 61 | NAME: 62 | amz-ssh - connect to an ec2 instance via ec2 connect 63 | 64 | USAGE: 65 | main [global options] command [command options] [arguments...] 66 | 67 | VERSION: 68 | 0.0.0 69 | 70 | COMMANDS: 71 | update Update the cli 72 | help, h Shows a list of commands or help for one command 73 | 74 | GLOBAL OPTIONS: 75 | --region value, -r value [$AWS_REGION] 76 | --tag value (default: "role:bastion") 77 | --instance-id value, -i value instance id to ssh to or tunnel through 78 | --user value, -u value OS user of bastion (default: "ec2-user") 79 | --tunnel value, -t value Host to tunnel to 80 | --destination value, -d value destination to ssh to via the bastion. This flag can be provided multiple times to allow for multple hops 81 | --port value, -p value (default: 22) 82 | --local-port value, --lp value local port to map to, defaults to tunnel port (default: 0) 83 | --debug (default: Print debug information) 84 | --help, -h show help (default: false) 85 | --version, -v print the version (default: false) 86 | ``` 87 | -------------------------------------------------------------------------------- /examples/spot-bastion/README.md: -------------------------------------------------------------------------------- 1 | #Simple Bastion Server 2 | 3 | ## Providers 4 | 5 | | Name | Version | 6 | |------|---------| 7 | | aws | n/a | 8 | 9 | ## Inputs 10 | 11 | | Name | Description | Type | Default | Required | 12 | |------|-------------|------|---------|:-----:| 13 | | instance\_type | Instance type to use for the bastion server | `string` | `"t3a.nano"` | no | 14 | | subnet\_id | (public} subnet to launch the instance in | `string` | n/a | yes | 15 | | tags | tags to add to resources created | `map(string)` | n/a | yes | 16 | 17 | ## Outputs 18 | 19 | | Name | Description | 20 | |------|-------------| 21 | | sg\_id | n/a | 22 | 23 | -------------------------------------------------------------------------------- /examples/spot-bastion/data.tf: -------------------------------------------------------------------------------- 1 | data "aws_ami" "amazon-linux-2" { 2 | most_recent = true 3 | owners = ["amazon"] 4 | 5 | filter { 6 | name = "owner-alias" 7 | values = ["amazon"] 8 | } 9 | 10 | filter { 11 | name = "name" 12 | values = ["amzn2-ami-hvm-*-x86_64-ebs"] 13 | } 14 | } 15 | 16 | data "aws_subnet" "selected" { 17 | id = var.subnet_id 18 | } 19 | -------------------------------------------------------------------------------- /examples/spot-bastion/ec2.tf: -------------------------------------------------------------------------------- 1 | resource "aws_spot_instance_request" "server" { 2 | ami = local.ami_id 3 | instance_type = var.instance_type 4 | subnet_id = var.subnet_id 5 | vpc_security_group_ids = [aws_security_group.bastion.id] 6 | associate_public_ip_address = true 7 | wait_for_fulfillment = true 8 | 9 | root_block_device { 10 | volume_size = 15 11 | delete_on_termination = true 12 | } 13 | 14 | tags = merge({ "Name" = "Bastion Host" }, var.tags) 15 | } 16 | 17 | -------------------------------------------------------------------------------- /examples/spot-bastion/locals.tf: -------------------------------------------------------------------------------- 1 | locals { 2 | ami_id = data.aws_ami.amazon-linux-2.id 3 | vpc_id = data.aws_subnet.selected.vpc_id 4 | } 5 | -------------------------------------------------------------------------------- /examples/spot-bastion/outputs.tf: -------------------------------------------------------------------------------- 1 | output "sg_id" { 2 | value = aws_security_group.bastion.id 3 | } 4 | -------------------------------------------------------------------------------- /examples/spot-bastion/sg.tf: -------------------------------------------------------------------------------- 1 | resource "aws_security_group" "bastion" { 2 | name = "Bastion" 3 | description = "Allow SSH access to bastion host and outbound internet access" 4 | vpc_id = local.vpc_id 5 | 6 | lifecycle { 7 | create_before_destroy = true 8 | } 9 | 10 | tags = var.tags 11 | } 12 | 13 | resource "aws_security_group_rule" "ssh" { 14 | protocol = "TCP" 15 | from_port = 22 16 | to_port = 22 17 | type = "ingress" 18 | cidr_blocks = ["0.0.0.0/0"] 19 | security_group_id = aws_security_group.bastion.id 20 | } 21 | 22 | resource "aws_security_group_rule" "internet" { 23 | protocol = "-1" 24 | from_port = 0 25 | to_port = 0 26 | type = "egress" 27 | cidr_blocks = ["0.0.0.0/0"] 28 | security_group_id = aws_security_group.bastion.id 29 | } 30 | -------------------------------------------------------------------------------- /examples/spot-bastion/variables.tf: -------------------------------------------------------------------------------- 1 | variable "instance_type" { 2 | description = "Instance type to use for the bastion server" 3 | default = "t3a.nano" 4 | } 5 | 6 | variable "tags" { 7 | type = map(string) 8 | description = "tags to add to resources created" 9 | } 10 | 11 | variable "subnet_id" { 12 | type = string 13 | description = "(public} subnet to launch the instance in" 14 | } 15 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/nodefortytwo/amz-ssh 2 | 3 | go 1.13 4 | 5 | require ( 6 | github.com/aws/aws-sdk-go v1.25.48 7 | github.com/blang/semver v3.5.1+incompatible 8 | github.com/pkg/errors v0.8.1 9 | github.com/rhysd/go-github-selfupdate v1.1.0 10 | github.com/sirupsen/logrus v1.4.2 11 | github.com/urfave/cli/v2 v2.0.0 12 | golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 13 | ) 14 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 2 | github.com/aws/aws-sdk-go v1.25.48 h1:J82DYDGZHOKHdhx6hD24Tm30c2C3GchYGfN0mf9iKUk= 3 | github.com/aws/aws-sdk-go v1.25.48/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo= 4 | github.com/blang/semver v3.5.1+incompatible h1:cQNTCjp13qL8KC3Nbxr/y2Bqb63oX6wdnnjpJbkM4JQ= 5 | github.com/blang/semver v3.5.1+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk= 6 | github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY= 7 | github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU= 8 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 9 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 10 | github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I= 11 | github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= 12 | github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM= 13 | github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= 14 | github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4rEjNlfyDHW9dolSY= 15 | github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ= 16 | github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk= 17 | github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck= 18 | github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI= 19 | github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU= 20 | github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf h1:WfD7VjIE6z8dIvMsI4/s+1qr5EL+zoIGev1BQj1eoJ8= 21 | github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf/go.mod h1:hyb9oH7vZsitZCiBt0ZvifOrB+qc8PS5IiilCIb87rg= 22 | github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM= 23 | github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k= 24 | github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk= 25 | github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ= 26 | github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI= 27 | github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo= 28 | github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= 29 | github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= 30 | github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= 31 | github.com/onsi/ginkgo v1.6.0 h1:Ix8l273rp3QzYgXSR+c8d1fTG7UPgYkOSELPhiY/YGw= 32 | github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE= 33 | github.com/onsi/gomega v1.4.2 h1:3mYCb7aPxS/RU7TI1y4rkEn1oKmPRjNJLNEXgw7MH2I= 34 | github.com/onsi/gomega v1.4.2/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY= 35 | github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I= 36 | github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= 37 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= 38 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 39 | github.com/rhysd/go-github-selfupdate v1.1.0 h1:+aMomy69YCYxJ6kr13nYIgAJWSB1kHK5M5YpbmjQkWo= 40 | github.com/rhysd/go-github-selfupdate v1.1.0/go.mod h1:jbfShZ+Nl3IHUgr77kwQjObcWf1z961UAoD6p5LrPBU= 41 | github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q= 42 | github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM= 43 | github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo= 44 | github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc= 45 | github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4= 46 | github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE= 47 | github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 48 | github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w= 49 | github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 50 | github.com/tcnksm/go-gitconfig v0.1.2 h1:iiDhRitByXAEyjgBqsKi9QU4o2TNtv9kPP3RgPgXBPw= 51 | github.com/tcnksm/go-gitconfig v0.1.2/go.mod h1:/8EhP4H7oJZdIPyT+/UIsG87kTzrzM4UsLGSItWYCpE= 52 | github.com/ulikunitz/xz v0.5.5 h1:pFrO0lVpTBXLpYw+pnLj6TbvHuyjXMfjGeCwSqCVwok= 53 | github.com/ulikunitz/xz v0.5.5/go.mod h1:2bypXElzHzzJZwzH67Y6wb67pO62Rzfn7BSiF4ABRW8= 54 | github.com/urfave/cli/v2 v2.0.0 h1:+HU9SCbu8GnEUFtIBfuUNXN39ofWViIEJIp6SURMpCg= 55 | github.com/urfave/cli/v2 v2.0.0/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ= 56 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 57 | golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 h1:ULYEB3JvPRE/IfO+9uO7vKV/xzVTO7XPAwm8xbf4w2g= 58 | golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= 59 | golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 60 | golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 61 | golang.org/x/net v0.0.0-20181108082009-03003ca0c849/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 62 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ= 63 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 64 | golang.org/x/oauth2 v0.0.0-20181106182150-f42d05182288 h1:JIqe8uIcRBHXDQVvZtHwp80ai3Lw3IJAeJEs55Dc1W0= 65 | golang.org/x/oauth2 v0.0.0-20181106182150-f42d05182288/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= 66 | golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 67 | golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ= 68 | golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 69 | golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 70 | golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 71 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 72 | golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 73 | golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc= 74 | golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 75 | golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= 76 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 77 | google.golang.org/appengine v1.3.0 h1:FBSsiFRMz3LBeXIomRnVzrQwSDj4ibvcRexLG0LZGQk= 78 | google.golang.org/appengine v1.3.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= 79 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 80 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY= 81 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 82 | gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4= 83 | gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= 84 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ= 85 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= 86 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 87 | gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw= 88 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 89 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "errors" 5 | "fmt" 6 | "math/rand" 7 | "os" 8 | "os/signal" 9 | "strings" 10 | "syscall" 11 | "time" 12 | 13 | "github.com/aws/aws-sdk-go/aws" 14 | awsSession "github.com/aws/aws-sdk-go/aws/session" 15 | "github.com/aws/aws-sdk-go/service/ec2" 16 | connect "github.com/aws/aws-sdk-go/service/ec2instanceconnect" 17 | log "github.com/sirupsen/logrus" 18 | "github.com/urfave/cli/v2" // imports as package "cli" 19 | 20 | "github.com/nodefortytwo/amz-ssh/pkg/sshutils" 21 | "github.com/nodefortytwo/amz-ssh/pkg/update" 22 | ) 23 | 24 | var version = "0.0.0" 25 | 26 | func main() { 27 | rand.Seed(time.Now().Unix()) 28 | setupSignalHandlers() 29 | app := &cli.App{ 30 | Name: "amz-ssh", 31 | Usage: "connect to an ec2 instance via ec2 connect", 32 | Version: version, 33 | Action: run, 34 | Flags: []cli.Flag{ 35 | &cli.StringFlag{ 36 | Name: "region", 37 | Aliases: []string{"r"}, 38 | EnvVars: []string{"AWS_REGION"}, 39 | Value: "eu-west-1", 40 | }, 41 | &cli.StringFlag{ 42 | Name: "tag", 43 | Value: "role:bastion", 44 | }, 45 | &cli.StringFlag{ 46 | Name: "instance-id", 47 | Aliases: []string{"i"}, 48 | Usage: "instance id to ssh to or tunnel through", 49 | Value: "", 50 | }, 51 | &cli.StringFlag{ 52 | Name: "user", 53 | Aliases: []string{"u"}, 54 | Usage: "OS user of bastion", 55 | Value: "ec2-user", 56 | }, 57 | &cli.StringFlag{ 58 | Name: "tunnel", 59 | Aliases: []string{"t"}, 60 | Usage: "Host to tunnel to", 61 | }, 62 | &cli.StringSliceFlag{ 63 | Name: "destination", 64 | Aliases: []string{"d"}, 65 | Usage: "destination to ssh to via the bastion. This flag can be provided multiple times to allow for multple hops", 66 | }, 67 | &cli.IntFlag{ 68 | Name: "port", 69 | Aliases: []string{"p"}, 70 | Value: 22, 71 | }, 72 | &cli.IntFlag{ 73 | Name: "local-port", 74 | Aliases: []string{"lp"}, 75 | Usage: "local port to map to, defaults to tunnel port", 76 | }, 77 | &cli.BoolFlag{ 78 | Name: "debug", 79 | Usage: "Print debug information", 80 | }, 81 | }, 82 | Commands: []*cli.Command{ 83 | { 84 | Name: "update", 85 | Usage: "Update the cli", 86 | Action: update.Handler, 87 | }, 88 | }, 89 | } 90 | 91 | err := app.Run(os.Args) 92 | if err != nil { 93 | log.Fatal(err) 94 | 95 | } 96 | } 97 | func setupSignalHandlers() { 98 | c := make(chan os.Signal, 2) 99 | signal.Notify(c, os.Interrupt, syscall.SIGTERM) 100 | go func() { 101 | <-c 102 | fmt.Println("\nGoodbye!") 103 | os.Exit(0) 104 | }() 105 | } 106 | 107 | func run(c *cli.Context) error { 108 | if c.Bool("debug") { 109 | log.SetLevel(log.DebugLevel) 110 | } 111 | 112 | var tagName string 113 | var tagValue string 114 | 115 | if parts := strings.Split(c.String("tag"), ":"); len(parts) == 2 { 116 | tagName = parts[0] 117 | tagValue = parts[1] 118 | } else { 119 | return fmt.Errorf("%s is not a valid tag definition, use key:value", c.String("tag")) 120 | } 121 | 122 | ec2Client := ec2Client(c.String("region")) 123 | connectClient := connectClient(c.String("region")) 124 | 125 | instanceID := c.String("instance-id") 126 | if instanceID == "" { 127 | var err error 128 | instanceID, err = resolveBastionInstanceID(ec2Client, tagName, tagValue) 129 | if err != nil { 130 | return err 131 | } 132 | } 133 | 134 | bastionAddr := fmt.Sprintf("%s@%s:%d", c.String("user"), instanceID, c.Int("port")) 135 | bastionEndpoint, err := sshutils.NewEC2Endpoint(bastionAddr, ec2Client, connectClient) 136 | if err != nil { 137 | return err 138 | } 139 | 140 | if tunnel := sshutils.NewEndpoint(c.String("tunnel")); tunnel.Host != "" { 141 | p := c.Int("local-port") 142 | if p == 0 { 143 | p = tunnel.Port 144 | } 145 | return sshutils.Tunnel(p, tunnel, bastionEndpoint) 146 | } 147 | 148 | chain := []sshutils.EndpointIface{ 149 | bastionEndpoint, 150 | } 151 | 152 | for _, ep := range c.StringSlice("destination") { 153 | destEndpoint, err := sshutils.NewEC2Endpoint(ep, ec2Client, connectClient) 154 | if err != nil { 155 | return err 156 | } 157 | destEndpoint.UsePrivate = true 158 | chain = append(chain, destEndpoint) 159 | } 160 | 161 | return sshutils.Connect(chain...) 162 | } 163 | 164 | func getSpotRequestByTag(ec2Client *ec2.EC2, tagName, tagValue string) (*ec2.DescribeSpotInstanceRequestsOutput, error) { 165 | return ec2Client.DescribeSpotInstanceRequests(&ec2.DescribeSpotInstanceRequestsInput{ 166 | Filters: []*ec2.Filter{ 167 | { 168 | Name: aws.String("tag:" + tagName), 169 | Values: aws.StringSlice([]string{tagValue}), 170 | }, 171 | { 172 | Name: aws.String("state"), 173 | Values: aws.StringSlice([]string{"active"}), 174 | }, 175 | { 176 | Name: aws.String("status-code"), 177 | Values: aws.StringSlice([]string{"fulfilled"}), 178 | }, 179 | }, 180 | }) 181 | } 182 | 183 | func getInstanceByTag(ec2Client *ec2.EC2, tagName, tagValue string) (*ec2.DescribeInstancesOutput, error) { 184 | return ec2Client.DescribeInstances(&ec2.DescribeInstancesInput{ 185 | Filters: []*ec2.Filter{ 186 | { 187 | Name: aws.String("tag:" + tagName), 188 | Values: aws.StringSlice([]string{tagValue}), 189 | }, 190 | { 191 | Name: aws.String("instance-state-name"), 192 | Values: aws.StringSlice([]string{"running"}), 193 | }, 194 | }, 195 | }) 196 | } 197 | 198 | func resolveBastionInstanceID(ec2Client *ec2.EC2, tagName, tagValue string) (string, error) { 199 | log.Info("Looking for bastion spot request") 200 | siro, err := getSpotRequestByTag(ec2Client, tagName, tagValue) 201 | if err != nil { 202 | return "", err 203 | } 204 | 205 | if len(siro.SpotInstanceRequests) > 0 { 206 | return aws.StringValue(siro.SpotInstanceRequests[rand.Intn(len(siro.SpotInstanceRequests))].InstanceId), nil 207 | } 208 | 209 | log.Info("No spot requests found, looking for instance directly") 210 | dio, err := getInstanceByTag(ec2Client, tagName, tagValue) 211 | if err != nil { 212 | return "", err 213 | } 214 | 215 | if len(dio.Reservations) > 0 { 216 | res := dio.Reservations[rand.Intn(len(dio.Reservations))] 217 | return aws.StringValue(res.Instances[rand.Intn(len(res.Instances))].InstanceId), nil 218 | } 219 | 220 | return "", errors.New("unable to find any valid bastion instances") 221 | } 222 | 223 | func ec2Client(region string) *ec2.EC2 { 224 | sess, err := awsSession.NewSession(&aws.Config{ 225 | Region: aws.String(region), 226 | }) 227 | if err != nil { 228 | log.Fatal(err) 229 | } 230 | 231 | return ec2.New(sess) 232 | } 233 | 234 | func connectClient(region string) *connect.EC2InstanceConnect { 235 | sess, err := awsSession.NewSession(&aws.Config{ 236 | Region: aws.String(region), 237 | }) 238 | if err != nil { 239 | log.Fatal(err) 240 | } 241 | 242 | return connect.New(sess) 243 | } 244 | -------------------------------------------------------------------------------- /pkg/sshutils/connect.go: -------------------------------------------------------------------------------- 1 | package sshutils 2 | 3 | import ( 4 | "fmt" 5 | log "github.com/sirupsen/logrus" 6 | "golang.org/x/crypto/ssh/terminal" 7 | 8 | "io" 9 | "net" 10 | "os" 11 | 12 | "golang.org/x/crypto/ssh" 13 | ) 14 | 15 | func Tunnel(localPort int, remoteHost EndpointIface, bastionHost EndpointIface) error { 16 | log.Debug("Opening tunnel") 17 | 18 | listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", "localhost", localPort)) 19 | if err != nil { 20 | return err 21 | } 22 | defer listener.Close() 23 | log.Infof("listening on %v", listener.Addr().(*net.TCPAddr)) 24 | for { 25 | conn, err := listener.Accept() 26 | if err != nil { 27 | return err 28 | } 29 | log.Debug("accepted connection") 30 | go forward(remoteHost, bastionHost, conn) 31 | } 32 | } 33 | 34 | func forward(remoteHost, bastionEndpoint EndpointIface, localConn net.Conn) { 35 | sshConfig, err := bastionEndpoint.GetSSHConfig() 36 | if err != nil { 37 | log.Error(err) 38 | } 39 | 40 | serverConn, err := ssh.Dial("tcp", bastionEndpoint.String(), sshConfig) 41 | if err != nil { 42 | log.Errorf("server dial error: %s", err) 43 | return 44 | } 45 | log.Debugf("connected to %s (1 of 2)", bastionEndpoint.String()) 46 | 47 | remoteConn, err := serverConn.Dial("tcp", remoteHost.String()) 48 | if err != nil { 49 | log.Errorf("remote dial error: %s", err) 50 | return 51 | } 52 | log.Debugf("connected to %s (2 of 2)", remoteHost.String()) 53 | 54 | copyConn := func(writer, reader net.Conn) { 55 | _, err := io.Copy(writer, reader) 56 | if err != nil { 57 | log.Errorf("io.Copy error: %s", err) 58 | } 59 | } 60 | go copyConn(localConn, remoteConn) 61 | go copyConn(remoteConn, localConn) 62 | } 63 | 64 | func Connect(bastionEndpoints ...EndpointIface) error { 65 | 66 | var client *ssh.Client 67 | for _, bastionEndpoint := range bastionEndpoints { 68 | sshConfig, err := bastionEndpoint.GetSSHConfig() 69 | if err != nil { 70 | return nil 71 | } 72 | 73 | serviceAddr := bastionEndpoint.String() 74 | log.Infof("Attempting to connect to %s", serviceAddr) 75 | // Tf this is the first endpint in the chain, create a new client 76 | // Otherwise use the previous ssh client 77 | if client == nil { 78 | client, err = ssh.Dial("tcp", serviceAddr, sshConfig) 79 | if err != nil { 80 | return fmt.Errorf("failed to dial: %s", err) 81 | } 82 | } else { 83 | conn, err := client.Dial("tcp", serviceAddr) 84 | if err != nil { 85 | return fmt.Errorf("failed to dial: %s", err) 86 | } 87 | ncc, chans, reqs, err := ssh.NewClientConn(conn, serviceAddr, sshConfig) 88 | if err != nil { 89 | return fmt.Errorf("failed to create new ssh connection to %s: %s", serviceAddr, err) 90 | } 91 | client = ssh.NewClient(ncc, chans, reqs) 92 | } 93 | } 94 | 95 | sess, err := client.NewSession() 96 | if err != nil { 97 | return fmt.Errorf("failed to create new session: %s", err) 98 | } 99 | defer sess.Close() 100 | 101 | // Set IO 102 | sess.Stdout = os.Stdout 103 | sess.Stderr = os.Stderr 104 | sess.Stdin = os.Stdin 105 | 106 | modes := ssh.TerminalModes{ 107 | ssh.ECHO: 1, 108 | ssh.TTY_OP_ISPEED: 14400, 109 | ssh.TTY_OP_OSPEED: 14400, 110 | } 111 | 112 | fileDescriptor := int(os.Stdin.Fd()) 113 | 114 | if terminal.IsTerminal(fileDescriptor) { 115 | originalState, err := terminal.MakeRaw(fileDescriptor) 116 | if err != nil { 117 | return nil 118 | } 119 | defer terminal.Restore(fileDescriptor, originalState) 120 | 121 | termWidth, termHeight, err := terminal.GetSize(fileDescriptor) 122 | if err != nil { 123 | return err 124 | } 125 | 126 | err = sess.RequestPty("xterm-256color", termHeight, termWidth, modes) 127 | if err != nil { 128 | return err 129 | } 130 | } 131 | 132 | if err := sess.Shell(); err != nil { 133 | log.Fatalf("failed to start shell: %s", err) 134 | } 135 | 136 | return sess.Wait() 137 | } 138 | -------------------------------------------------------------------------------- /pkg/sshutils/ec2endpoint.go: -------------------------------------------------------------------------------- 1 | package sshutils 2 | 3 | import ( 4 | "fmt" 5 | "strconv" 6 | "strings" 7 | 8 | "github.com/aws/aws-sdk-go/aws" 9 | "github.com/aws/aws-sdk-go/aws/awserr" 10 | "github.com/aws/aws-sdk-go/service/ec2" 11 | connect "github.com/aws/aws-sdk-go/service/ec2instanceconnect" 12 | "github.com/pkg/errors" 13 | log "github.com/sirupsen/logrus" 14 | "golang.org/x/crypto/ssh" 15 | ) 16 | 17 | type EC2Endpoint struct { 18 | InstanceID string 19 | Port int 20 | User string 21 | PrivateKey string 22 | PublicKey string 23 | UsePrivate bool 24 | 25 | Instance *ec2.Instance 26 | EC2Client *ec2.EC2 27 | ConnectClient *connect.EC2InstanceConnect 28 | } 29 | 30 | func NewEC2Endpoint(InstanceID string, ec2Client *ec2.EC2, connectClient *connect.EC2InstanceConnect) (*EC2Endpoint, error) { 31 | endpoint := EC2Endpoint{ 32 | InstanceID: InstanceID, 33 | User: "ec2-user", 34 | Port: 22, 35 | EC2Client: ec2Client, 36 | ConnectClient: connectClient, 37 | } 38 | var err error 39 | 40 | if parts := strings.Split(endpoint.InstanceID, "@"); len(parts) > 1 { 41 | endpoint.User = parts[0] 42 | endpoint.InstanceID = parts[1] 43 | } 44 | 45 | if parts := strings.Split(endpoint.InstanceID, ":"); len(parts) > 1 { 46 | endpoint.InstanceID = parts[0] 47 | endpoint.Port, _ = strconv.Atoi(parts[1]) 48 | } 49 | 50 | endpoint.PrivateKey, endpoint.PublicKey, err = GenerateKeys() 51 | if err != nil { 52 | return &endpoint, err 53 | } 54 | 55 | endpoint.Instance, err = getEC2Instance(endpoint.InstanceID, endpoint.EC2Client) 56 | if err != nil { 57 | return &endpoint, err 58 | } 59 | 60 | return &endpoint, nil 61 | } 62 | 63 | func (e *EC2Endpoint) String() string { 64 | err := sendPublicKey(e.Instance, e.User, e.PublicKey, e.ConnectClient) 65 | if err != nil { 66 | log.Fatal(err) 67 | } 68 | if e.UsePrivate { 69 | return fmt.Sprintf("%s:%d", aws.StringValue(e.Instance.PrivateIpAddress), e.Port) 70 | } 71 | 72 | return fmt.Sprintf("%s:%d", aws.StringValue(e.Instance.PublicIpAddress), e.Port) 73 | } 74 | 75 | func (e *EC2Endpoint) GetSSHConfig() (*ssh.ClientConfig, error) { 76 | key, err := ssh.ParsePrivateKey([]byte(e.PrivateKey)) 77 | if err != nil { 78 | return nil, err 79 | } 80 | 81 | return &ssh.ClientConfig{ 82 | User: e.User, 83 | Auth: []ssh.AuthMethod{ 84 | ssh.PublicKeys(key), 85 | }, 86 | HostKeyCallback: ssh.InsecureIgnoreHostKey(), 87 | }, nil 88 | } 89 | 90 | func sendPublicKey(instance *ec2.Instance, user, publicKey string, client *connect.EC2InstanceConnect) error { 91 | 92 | out, err := client.SendSSHPublicKey(&connect.SendSSHPublicKeyInput{ 93 | AvailabilityZone: instance.Placement.AvailabilityZone, 94 | InstanceId: instance.InstanceId, 95 | InstanceOSUser: aws.String(user), 96 | SSHPublicKey: aws.String(publicKey), 97 | }) 98 | 99 | if err != nil { 100 | if awsErr, ok := err.(awserr.Error); ok { 101 | if awsErr.Code() == connect.ErrCodeThrottlingException { 102 | log.Debug("Got throttling exception, usually just means the key is already valid") 103 | return nil 104 | } 105 | } 106 | 107 | return errors.Wrap(err, "send public key error") 108 | } 109 | 110 | if !*out.Success { 111 | return fmt.Errorf("request failed but no error was returned. Request ID: %s", aws.StringValue(out.RequestId)) 112 | } 113 | 114 | return nil 115 | } 116 | 117 | func getEC2Instance(id string, client *ec2.EC2) (*ec2.Instance, error) { 118 | instanceOutput, err := client.DescribeInstances(&ec2.DescribeInstancesInput{ 119 | InstanceIds: []*string{aws.String(id)}, 120 | }) 121 | 122 | if err != nil { 123 | return nil, err 124 | } 125 | 126 | if len(instanceOutput.Reservations) == 0 || len(instanceOutput.Reservations[0].Instances) == 0 { 127 | return nil, errors.New("instance not found") 128 | } 129 | 130 | return instanceOutput.Reservations[0].Instances[0], nil 131 | } 132 | -------------------------------------------------------------------------------- /pkg/sshutils/endpoint.go: -------------------------------------------------------------------------------- 1 | package sshutils 2 | 3 | import ( 4 | "fmt" 5 | 6 | "strconv" 7 | "strings" 8 | 9 | "golang.org/x/crypto/ssh" 10 | ) 11 | 12 | type EndpointIface interface { 13 | String() string 14 | GetSSHConfig() (*ssh.ClientConfig, error) 15 | } 16 | 17 | type Endpoint struct { 18 | Host string 19 | Port int 20 | User string 21 | PrivateKey string 22 | PublicKey string 23 | } 24 | 25 | func NewEndpoint(s string) *Endpoint { 26 | endpoint := Endpoint{ 27 | Host: s, 28 | } 29 | 30 | if parts := strings.Split(endpoint.Host, "@"); len(parts) > 1 { 31 | endpoint.User = parts[0] 32 | endpoint.Host = parts[1] 33 | } 34 | 35 | if parts := strings.Split(endpoint.Host, ":"); len(parts) > 1 { 36 | endpoint.Host = parts[0] 37 | endpoint.Port, _ = strconv.Atoi(parts[1]) 38 | } 39 | 40 | if endpoint.Port == 0 { 41 | endpoint.Port = 22 42 | } 43 | 44 | return &endpoint 45 | } 46 | 47 | func (e *Endpoint) String() string { 48 | return fmt.Sprintf("%s:%d", e.Host, e.Port) 49 | } 50 | 51 | func (e *Endpoint) GetSSHConfig() (*ssh.ClientConfig, error) { 52 | key, err := ssh.ParsePrivateKey([]byte(e.PrivateKey)) 53 | if err != nil { 54 | return nil, err 55 | } 56 | 57 | return &ssh.ClientConfig{ 58 | User: e.User, 59 | Auth: []ssh.AuthMethod{ 60 | ssh.PublicKeys(key), 61 | }, 62 | HostKeyCallback: ssh.InsecureIgnoreHostKey(), 63 | }, nil 64 | } 65 | -------------------------------------------------------------------------------- /pkg/sshutils/keys.go: -------------------------------------------------------------------------------- 1 | package sshutils 2 | 3 | import ( 4 | "crypto/rand" 5 | "crypto/rsa" 6 | "crypto/x509" 7 | "encoding/pem" 8 | log "github.com/sirupsen/logrus" 9 | "golang.org/x/crypto/ssh" 10 | ) 11 | 12 | func GenerateKeys() (string, string, error) { 13 | bitSize := 4096 14 | privateKey, err := generatePrivateKey(bitSize) 15 | if err != nil { 16 | return "", "", err 17 | } 18 | 19 | publicKeyBytes, err := generatePublicKey(&privateKey.PublicKey) 20 | if err != nil { 21 | return "", "", err 22 | } 23 | 24 | privateKeyBytes := encodePrivateKeyToPEM(privateKey) 25 | return string(privateKeyBytes), string(publicKeyBytes), nil 26 | } 27 | 28 | // generatePrivateKey creates a RSA Private Key of specified byte size 29 | func generatePrivateKey(bitSize int) (*rsa.PrivateKey, error) { 30 | // Private Key generation 31 | privateKey, err := rsa.GenerateKey(rand.Reader, bitSize) 32 | if err != nil { 33 | return nil, err 34 | } 35 | 36 | // Validate Private Key 37 | err = privateKey.Validate() 38 | if err != nil { 39 | return nil, err 40 | } 41 | 42 | log.Debug("Private Key generated") 43 | return privateKey, nil 44 | } 45 | 46 | // encodePrivateKeyToPEM encodes Private Key from RSA to PEM format 47 | func encodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte { 48 | // Get ASN.1 DER format 49 | privDER := x509.MarshalPKCS1PrivateKey(privateKey) 50 | 51 | // pem.Block 52 | privBlock := pem.Block{ 53 | Type: "RSA PRIVATE KEY", 54 | Headers: nil, 55 | Bytes: privDER, 56 | } 57 | 58 | // Private key in PEM format 59 | privatePEM := pem.EncodeToMemory(&privBlock) 60 | 61 | return privatePEM 62 | } 63 | 64 | // generatePublicKey take a rsa.PublicKey and return bytes suitable for writing to .pub file 65 | // returns in the format "ssh-rsa ..." 66 | func generatePublicKey(privatekey *rsa.PublicKey) ([]byte, error) { 67 | publicRsaKey, err := ssh.NewPublicKey(privatekey) 68 | if err != nil { 69 | return nil, err 70 | } 71 | 72 | pubKeyBytes := ssh.MarshalAuthorizedKey(publicRsaKey) 73 | 74 | log.Debug("Public key generated") 75 | return pubKeyBytes, nil 76 | } 77 | -------------------------------------------------------------------------------- /pkg/update/update.go: -------------------------------------------------------------------------------- 1 | package update 2 | 3 | import ( 4 | "github.com/blang/semver" 5 | "github.com/rhysd/go-github-selfupdate/selfupdate" 6 | log "github.com/sirupsen/logrus" 7 | "github.com/urfave/cli/v2" 8 | ) 9 | 10 | //Handler replaces the current running binary with the latest version from github 11 | func Handler(c *cli.Context) error { 12 | v := semver.MustParse(c.App.Version) 13 | latest, err := selfupdate.UpdateSelf(v, "nodefortytwo/amz-ssh") 14 | if err != nil { 15 | log.Println("Binary update failed:", err) 16 | return nil 17 | } 18 | if latest.Version.Equals(v) { 19 | // latest version is the same as current version. It means current binary is up to date. 20 | log.Println("Current binary is the latest version", c.App.Version) 21 | } else { 22 | log.Println("Successfully updated to version", latest.Version) 23 | log.Println("Release note:\n", latest.ReleaseNotes) 24 | } 25 | 26 | return nil 27 | } 28 | --------------------------------------------------------------------------------