├── .gitignore ├── requirements.txt ├── README.md ├── aws-ssh-config.py └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | .vscode/ 2 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | boto 2 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | aws-ssh-config 2 | ====== 3 | 4 | Description 5 | --- 6 | 7 | A very simple script that queries the AWS EC2 API with boto and generates a SSH config file ready to use. 8 | There are a few similar scripts around but I couldn't find one that would satisfy all my wish list: 9 | 10 | - Connect to all regions at once 11 | - Do AMI -> user lookup (regexp-based) 12 | - Support public/private IP addresses (for VPNs and VPCs) 13 | - Support multiple instances with same tags (e.g. autoscaling groups) and provide an incremental count for duplicates based on instance launch time 14 | - Support multiple customizable tags concatenations in a user-provided order 15 | - Support region (with AZ) in the host name concatenation 16 | - Properly leverage tab completion 17 | 18 | Load modules 19 | --- 20 | 21 | - Use `pip` to load the required modules 22 | 23 | ``` 24 | pip install -r requirements.txt 25 | ``` 26 | 27 | Usage 28 | --- 29 | 30 | This assumes boto is installed and configured. Also, private ssh keys must be copied under `~/.ssh/` 31 | 32 | Supported arguments: 33 | 34 | ``` 35 | usage: aws-ssh-config.py [-h] [--default-user DEFAULT_USER] [--keydir KEYDIR] 36 | [--no-identities-only] [--postfix POSTFIX] 37 | [--prefix PREFIX] [--private] [--profile PROFILE] 38 | [--proxy PROXY] [--region] 39 | [--ssh-key-name SSH_KEY_NAME] 40 | [--strict-hostkey-checking] [--tags TAGS] 41 | [--user USER] 42 | [--white-list-region WHITE_LIST_REGION [WHITE_LIST_REGION ...]] 43 | 44 | optional arguments: 45 | -h, --help show this help message and exit 46 | --default-user DEFAULT_USER 47 | Default ssh username to use if it can't be detected 48 | from AMI name 49 | --keydir KEYDIR Location of private keys 50 | --no-identities-only Do not include IdentitiesOnly=yes in ssh config; may 51 | cause connection refused if using ssh-agent 52 | --postfix POSTFIX Specify a postfix to append to all host names 53 | --prefix PREFIX Specify a prefix to prepend to all host names 54 | --private Use private IP addresses (public are used by default) 55 | --profile PROFILE Specify AWS credential profile to use 56 | --proxy PROXY Specify a bastion host for ProxyCommand 57 | --region Append the region name at the end of the concatenation 58 | --ssh-key-name SSH_KEY_NAME 59 | Override the ssh key to use 60 | --strict-hostkey-checking 61 | Do not include StrictHostKeyChecking=no in ssh config 62 | --tags TAGS A comma-separated list of tag names to be considered 63 | for concatenation. If omitted, all tags will be used 64 | --user USER Override the ssh username for all hosts 65 | --white-list-region WHITE_LIST_REGION [WHITE_LIST_REGION ...] 66 | Which regions must be included. If omitted, all 67 | regions are considered 68 | ``` 69 | 70 | By default, it will name hosts by concatenating all tags: 71 | 72 | ``` 73 | gianluca@sid:~$ python aws-ssh-config.py > ~/.ssh/config 74 | gianluca@sid:~$ cat ~/.ssh/config 75 | Host dev-worker-1 76 | HostName 54.173.109.173 77 | User ec2-user 78 | IdentityFile ~/.ssh/dev.pem 79 | IdentitiesOnly yes 80 | StrictHostKeyChecking no 81 | 82 | Host dev-worker-2 83 | HostName 54.173.190.141 84 | User ec2-user 85 | IdentityFile ~/.ssh/dev.pem 86 | IdentitiesOnly yes 87 | StrictHostKeyChecking no 88 | 89 | Host prod-worker-1 90 | HostName 54.164.168.30 91 | User ec2-user 92 | IdentityFile ~/.ssh/prod.pem 93 | IdentitiesOnly yes 94 | StrictHostKeyChecking no 95 | 96 | Host prod-worker-2 97 | HostName 54.174.115.242 98 | User ubuntu 99 | IdentityFile ~/.ssh/prod.pem 100 | IdentitiesOnly yes 101 | StrictHostKeyChecking no 102 | ``` 103 | 104 | ssh completion will immediately work: 105 | 106 | ``` 107 | gianluca@sid:~$ ssh d[TAB] 108 | dev-worker-1 109 | dev-worker-2 110 | ``` 111 | If the ssh completion will not immediately work you should add the following script to your `.bash_profile` 112 | 113 | ``` 114 | _complete_ssh_hosts () 115 | { 116 | COMPREPLY=() 117 | cur="${COMP_WORDS[COMP_CWORD]}" 118 | comp_ssh_hosts=`cat ~/.ssh/known_hosts | \ 119 | cut -f 1 -d ' ' | \ 120 | sed -e s/,.*//g | \ 121 | grep -v ^# | \ 122 | uniq | \ 123 | grep -v "\[" ; 124 | cat ~/.ssh/config | \ 125 | grep "^Host " | \ 126 | awk '{print $2}' 127 | ` 128 | COMPREPLY=( $(compgen -W "${comp_ssh_hosts}" -- $cur)) 129 | return 0 130 | } 131 | complete -F _complete_ssh_hosts ssh 132 | ``` 133 | and run `gianluca@sid:~$ source .bash_profile` 134 | 135 | It's possible to customize which tags one is interested in, as well as the order used for concatenation: 136 | 137 | ``` 138 | gianluca@sid:~$ python aws-ssh-config.py --tags Name > ~/.ssh/config 139 | gianluca@sid:~$ cat ~/.ssh/config 140 | Host worker-1 141 | HostName 54.173.109.173 142 | User ec2-user 143 | IdentityFile ~/.ssh/dev.pem 144 | IdentitiesOnly yes 145 | StrictHostKeyChecking no 146 | 147 | Host worker-2 148 | HostName 54.173.190.141 149 | User ec2-user 150 | IdentityFile ~/.ssh/dev.pem 151 | IdentitiesOnly yes 152 | StrictHostKeyChecking no 153 | 154 | Host worker-3 155 | HostName 54.164.168.30 156 | User ec2-user 157 | IdentityFile ~/.ssh/prod.pem 158 | IdentitiesOnly yes 159 | StrictHostKeyChecking no 160 | 161 | Host worker-4 162 | HostName 54.174.115.242 163 | User ubuntu 164 | IdentityFile ~/.ssh/prod.pem 165 | IdentitiesOnly yes 166 | StrictHostKeyChecking no 167 | 168 | gianluca@sid:~$ python aws-ssh-config.py --tags Name,Infrastructure > ~/.ssh/config 169 | gianluca@sid:~$ cat ~/.ssh/config 170 | Host worker-dev-1 171 | HostName 54.173.109.173 172 | User ec2-user 173 | IdentityFile ~/.ssh/dev.pem 174 | IdentitiesOnly yes 175 | StrictHostKeyChecking no 176 | 177 | Host worker-dev-2 178 | HostName 54.173.190.141 179 | User ec2-user 180 | IdentityFile ~/.ssh/dev.pem 181 | IdentitiesOnly yes 182 | StrictHostKeyChecking no 183 | 184 | Host worker-prod-1 185 | HostName 54.164.168.30 186 | User ec2-user 187 | IdentityFile ~/.ssh/prod.pem 188 | IdentitiesOnly yes 189 | StrictHostKeyChecking no 190 | 191 | Host worker-prod-2 192 | HostName 54.174.115.242 193 | User ubuntu 194 | IdentityFile ~/.ssh/prod.pem 195 | IdentitiesOnly yes 196 | StrictHostKeyChecking no 197 | 198 | ``` 199 | 200 | By default, the ssh user is calculated from a regular expression based on the AMI name. A default user can be set with `--default-user` to use if no matches are found, otherwise a warning is printed on standard error and one can edit the script and add the rule to the `AMIS_TO_USER` dictionary: 201 | 202 | ``` 203 | gianluca@sid:~$ python aws-ssh-config.py > ~/.ssh/config 204 | Can't lookup user for AMI 'ubuntu/images/hvm-ssd/ubuntu-trusty-14.04-amd64-server-20140926', add a rule to the script 205 | ``` 206 | 207 | The `--user` param can also be used to use a single username for all hosts. 208 | -------------------------------------------------------------------------------- /aws-ssh-config.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | 3 | import argparse 4 | import re 5 | import sys 6 | import time 7 | import boto.ec2 8 | 9 | 10 | AMI_NAMES_TO_USER = { 11 | 'amzn' : 'ec2-user', 12 | 'ubuntu' : 'ubuntu', 13 | 'CentOS' : 'root', 14 | 'DataStax' : 'ubuntu', 15 | 'CoreOS' : 'core' 16 | } 17 | 18 | AMI_IDS_TO_USER = { 19 | 'ami-ada2b6c4' : 'ubuntu' 20 | } 21 | 22 | AMI_IDS_TO_KEY = { 23 | 'ami-ada2b6c4' : 'custom_key' 24 | } 25 | 26 | BLACKLISTED_REGIONS = [ 27 | 'cn-north-1', 28 | 'us-gov-west-1' 29 | ] 30 | 31 | 32 | def generate_id(instance, tags_filter, region): 33 | instance_id = '' 34 | 35 | if tags_filter is not None: 36 | for tag in tags_filter.split(','): 37 | value = instance.tags.get(tag, None) 38 | if value: 39 | if not instance_id: 40 | instance_id = value 41 | else: 42 | instance_id += '-' + value 43 | else: 44 | for tag, value in instance.tags.items(): 45 | if not tag.startswith('aws'): 46 | if not instance_id: 47 | instance_id = value 48 | else: 49 | instance_id += '-' + value 50 | 51 | if not instance_id: 52 | instance_id = instance.id 53 | 54 | if region: 55 | instance_id += '-' + instance.placement 56 | 57 | return instance_id 58 | 59 | 60 | def main(): 61 | parser = argparse.ArgumentParser() 62 | parser.add_argument('--default-user', help='Default ssh username to use if it can\'t be detected from AMI name') 63 | parser.add_argument('--keydir', default='~/.ssh/', help='Location of private keys') 64 | parser.add_argument('--no-identities-only', action='store_true', help='Do not include IdentitiesOnly=yes in ssh config; may cause connection refused if using ssh-agent') 65 | parser.add_argument('--postfix', default='', help='Specify a postfix to append to all host names') 66 | parser.add_argument('--prefix', default='', help='Specify a prefix to prepend to all host names') 67 | parser.add_argument('--private', action='store_true', help='Use private IP addresses (public are used by default)') 68 | parser.add_argument('--profile', help='Specify AWS credential profile to use') 69 | parser.add_argument('--proxy', default='', help='Specify a bastion host for ProxyCommand') 70 | parser.add_argument('--region', action='store_true', help='Append the region name at the end of the concatenation') 71 | parser.add_argument('--ssh-key-name', default='', help='Override the ssh key to use') 72 | parser.add_argument('--strict-hostkey-checking', action='store_true', help='Do not include StrictHostKeyChecking=no in ssh config') 73 | parser.add_argument('--tags', help='A comma-separated list of tag names to be considered for concatenation. If omitted, all tags will be used') 74 | parser.add_argument('--user', help='Override the ssh username for all hosts') 75 | parser.add_argument('--white-list-region', default='', help='Which regions must be included. If omitted, all regions are considered', nargs='+') 76 | 77 | args = parser.parse_args() 78 | 79 | instances = {} 80 | counts_total = {} 81 | counts_incremental = {} 82 | amis = AMI_IDS_TO_USER.copy() 83 | 84 | print('# Generated on ' + time.asctime(time.localtime(time.time()))) 85 | print('# ' + ' '.join(sys.argv)) 86 | print('# ') 87 | print('') 88 | 89 | for region in boto.ec2.regions(): 90 | if args.white_list_region and region.name not in args.white_list_region: 91 | continue 92 | if region.name in BLACKLISTED_REGIONS: 93 | continue 94 | if args.profile: 95 | conn = boto.ec2.connect_to_region(region.name, profile_name=args.profile) 96 | else: 97 | conn = boto.ec2.connect_to_region(region.name) 98 | 99 | for instance in conn.get_only_instances(): 100 | if instance.state != 'running': 101 | continue 102 | 103 | if instance.platform == 'windows': 104 | continue 105 | 106 | if instance.key_name is None: 107 | continue 108 | 109 | if instance.launch_time not in instances: 110 | instances[instance.launch_time] = [] 111 | 112 | instances[instance.launch_time].append(instance) 113 | 114 | instance_id = generate_id(instance, args.tags, args.region) 115 | 116 | if instance_id not in counts_total: 117 | counts_total[instance_id] = 0 118 | counts_incremental[instance_id] = 0 119 | 120 | counts_total[instance_id] += 1 121 | 122 | if args.user: 123 | amis[instance.image_id] = args.user 124 | else: 125 | if not instance.image_id in amis: 126 | image = conn.get_image(instance.image_id) 127 | 128 | for ami, user in AMI_NAMES_TO_USER.items(): 129 | regexp = re.compile(ami) 130 | if image and regexp.match(image.name): 131 | amis[instance.image_id] = user 132 | break 133 | 134 | if instance.image_id not in amis: 135 | amis[instance.image_id] = args.default_user 136 | if args.default_user is None: 137 | image_label = image.name if image is not None else instance.image_id 138 | sys.stderr.write('Can\'t lookup user for AMI \'' + image_label + '\', add a rule to the script\n') 139 | 140 | for k in sorted(instances): 141 | for instance in instances[k]: 142 | if args.private: 143 | if instance.private_ip_address: 144 | ip_addr = instance.private_ip_address 145 | else: 146 | if instance.ip_address: 147 | ip_addr = instance.ip_address 148 | elif instance.private_ip_address: 149 | ip_addr = instance.private_ip_address 150 | else: 151 | sys.stderr.write('Cannot lookup ip address for instance %s, skipped it.' % instance.id) 152 | continue 153 | 154 | instance_id = generate_id(instance, args.tags, args.region) 155 | 156 | if counts_total[instance_id] != 1: 157 | counts_incremental[instance_id] += 1 158 | instance_id += '-' + str(counts_incremental[instance_id]) 159 | 160 | hostid = args.prefix + instance_id + args.postfix 161 | hostid = hostid.replace(' ', '_') # get rid of spaces 162 | 163 | if instance.id: 164 | print('# id: ' + instance.id) 165 | print('Host ' + hostid) 166 | print(' HostName ' + ip_addr) 167 | 168 | try: 169 | if amis[instance.image_id] is not None: 170 | print(' User ' + amis[instance.image_id]) 171 | except: 172 | pass 173 | 174 | if args.keydir: 175 | keydir = args.keydir 176 | else: 177 | keydir = '~/.ssh/' 178 | 179 | if args.ssh_key_name: 180 | print(' IdentityFile ' + keydir + args.ssh_key_name + '.pem') 181 | else: 182 | key_name = AMI_IDS_TO_KEY.get(instance.image_id, instance.key_name) 183 | 184 | print(' IdentityFile ' + keydir + key_name.replace(' ', '_') + '.pem') 185 | 186 | if not args.no_identities_only: 187 | # ensure ssh-agent keys don't flood when we know the right file to use 188 | print(' IdentitiesOnly yes') 189 | if not args.strict_hostkey_checking: 190 | print(' StrictHostKeyChecking no') 191 | if args.proxy: 192 | print(' ProxyCommand ssh ' + args.proxy + ' -W %h:%p') 193 | print('') 194 | 195 | 196 | if __name__ == '__main__': 197 | main() 198 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 271 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 272 | REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 273 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 274 | OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 275 | TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 276 | YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 277 | PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 278 | POSSIBILITY OF SUCH DAMAGES. 279 | 280 | END OF TERMS AND CONDITIONS 281 | 282 | How to Apply These Terms to Your New Programs 283 | 284 | If you develop a new program, and you want it to be of the greatest 285 | possible use to the public, the best way to achieve this is to make it 286 | free software which everyone can redistribute and change under these terms. 287 | 288 | To do so, attach the following notices to the program. It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | --------------------------------------------------------------------------------