forked from magnusewe/aws-ec2-ssh
-
Notifications
You must be signed in to change notification settings - Fork 0
/
showcase.yaml
271 lines (260 loc) · 10.3 KB
/
showcase.yaml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
---
AWSTemplateFormatVersion: '2010-09-09'
Description: 'AWS EC2 SSH access with IAM showcase'
Parameters:
VPC:
Type: 'AWS::EC2::VPC::Id'
Description: 'The VPC the EC2 instance is launched into.'
Subnet:
Type: 'AWS::EC2::Subnet::Id'
Description: 'The subnet the EC2 instance is launched into.'
AssumeRole:
Type: 'String'
Description: 'The role to assume to get the IAM users to provision into the instance'
Default: ''
Mappings:
RegionMap:
'ap-south-1':
AMI: 'ami-cacbbea5'
'eu-west-1':
AMI: 'ami-d41d58a7'
'ap-northeast-2':
AMI: 'ami-a04297ce'
'ap-northeast-1':
AMI: 'ami-1a15c77b'
'sa-east-1':
AMI: 'ami-b777e4db'
'ap-southeast-1':
AMI: 'ami-7243e611'
'ap-southeast-2':
AMI: 'ami-55d4e436'
'eu-central-1':
AMI: 'ami-0044b96f'
'us-east-1':
AMI: 'ami-c481fad3'
'us-east-2':
AMI: 'ami-71ca9114'
'us-west-1':
AMI: 'ami-de347abe'
'us-west-2':
AMI: 'ami-b04e92d0'
Conditions:
UseCrossAccountIAM: !Not [!Equals [!Ref AssumeRole, '']]
UseLocalIAM: !Equals [!Ref AssumeRole, '']
Resources:
SecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupDescription: ssh
VpcId: !Ref VPC
SecurityGroupIngress:
- CidrIp: '0.0.0.0/0'
IpProtocol: tcp
FromPort: 22
ToPort: 22
InstanceProfile:
Type: 'AWS::IAM::InstanceProfile'
Properties:
Roles:
- !Ref Role
Role:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service: 'ec2.amazonaws.com'
Action: 'sts:AssumeRole'
Path: /
CrossAccountRolePolicy:
Type: 'AWS::IAM::Policy'
Condition: UseCrossAccountIAM
Properties:
PolicyName: crossaccountiam
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'sts:AssumeRole'
Resource: !Ref AssumeRole
Roles:
- !Ref Role
LocalRolePolicy:
Type: 'AWS::IAM::Policy'
Condition: UseLocalIAM
Properties:
PolicyName: iam
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'iam:ListUsers'
Resource: '*'
- Effect: Allow
Action:
- 'iam:ListSSHPublicKeys'
- 'iam:GetSSHPublicKey'
Resource: !Sub 'arn:aws:iam::${AWS::AccountId}:user/*'
Roles:
- !Ref Role
Instance:
Type: AWS::EC2::Instance
Metadata:
'AWS::CloudFormation::Init':
config:
files:
'/opt/authorized_keys_command.sh':
!Sub: |
#!/bin/bash -e
if [ -z "$1" ]; then
exit 1
fi
# Assume a role before contacting AWS IAM to get users and keys.
# This can be used if you define your users in one AWS account, while the EC2
# instance you use this script runs in another.
AssumeRole="${AssumeRole}"
if [[ ! -z "${!AssumeRole}" ]]
then
STSCredentials=$(aws sts assume-role \
--role-arn "${!AssumeRole}" \
--role-session-name something \
--query '[Credentials.SessionToken,Credentials.AccessKeyId,Credentials.SecretAccessKey]' \
--output text)
AWS_ACCESS_KEY_ID=$(echo "${!STSCredentials}" | awk '{print $2}')
AWS_SECRET_ACCESS_KEY=$(echo "${!STSCredentials}" | awk '{print $3}')
AWS_SESSION_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
AWS_SECURITY_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN AWS_SECURITY_TOKEN
fi
SaveUserName="$1"
SaveUserName=${!SaveUserName//"+"/".plus."}
SaveUserName=${!SaveUserName//"="/".equal."}
SaveUserName=${!SaveUserName//","/".comma."}
SaveUserName=${!SaveUserName//"@"/".at."}
aws iam list-ssh-public-keys --user-name "$SaveUserName" --query "SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]" --output text | while read KeyId; do
aws iam get-ssh-public-key --user-name "$SaveUserName" --ssh-public-key-id "$KeyId" --encoding SSH --query "SSHPublicKey.SSHPublicKeyBody" --output text
done
mode: '000755'
owner: root
group: root
'/opt/import_users.sh':
!Sub: |
#!/bin/bash
# Assume a role before contacting AWS IAM to get users and keys.
# This can be used if you define your users in one AWS account, while the EC2
# instance you use this script runs in another.
AssumeRole="${AssumeRole}"
if [[ ! -z "${!AssumeRole}" ]]
then
STSCredentials=$(aws sts assume-role \
--role-arn "${!AssumeRole}" \
--role-session-name something \
--query '[Credentials.SessionToken,Credentials.AccessKeyId,Credentials.SecretAccessKey]' \
--output text)
AWS_ACCESS_KEY_ID=$(echo "${!STSCredentials}" | awk '{print $2}')
AWS_SECRET_ACCESS_KEY=$(echo "${!STSCredentials}" | awk '{print $3}')
AWS_SESSION_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
AWS_SECURITY_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN AWS_SECURITY_TOKEN
fi
# Specify an IAM group for users who should be given sudo privileges, or leave
# empty to not change sudo access, or give it the value '##ALL##' to have all
# users be given sudo rights.
SudoersGroup=""
[[ -z "${!SudoersGroup}" ]] || [[ "${!SudoersGroup}" == "##ALL##" ]] || Sudoers=$(
aws iam get-group --group-name "${!SudoersGroup}" --query "Users[].[UserName]" --output text
);
aws iam list-users --query "Users[].[UserName]" --output text | while read User; do
SaveUserName="$User"
SaveUserName=${!SaveUserName//"+"/".plus."}
SaveUserName=${!SaveUserName//"="/".equal."}
SaveUserName=${!SaveUserName//","/".comma."}
SaveUserName=${!SaveUserName//"@"/".at."}
if ! grep "^$SaveUserName:" /etc/passwd > /dev/null; then
/usr/sbin/useradd --create-home --shell /bin/bash "$SaveUserName"
fi
if [[ ! -z "${!SudoersGroup}" ]]; then
# sudo will read each file in /etc/sudoers.d, skipping file names that end
# in ‘~’ or contain a ‘.’ character to avoid causing problems with package
# manager or editor temporary/backup files.
SaveUserFileName=$(echo "$SaveUserName" | tr "." " ")
SaveUserSudoFilePath="/etc/sudoers.d/$SaveUserFileName"
if [[ "${!SudoersGroup}" == "##ALL##" ]] || echo "$Sudoers" | grep "^$User\$" > /dev/null; then
echo "$SaveUserName ALL=(ALL) NOPASSWD:ALL" > "$SaveUserSudoFilePath"
else
[[ ! -f "$SaveUserSudoFilePath" ]] || rm "$SaveUserSudoFilePath"
fi
fi
done
mode: '000755'
owner: root
group: root
'/etc/cron.d/import_users':
content: |
*/10 * * * * root /opt/import_users.sh
mode: '000644'
owner: root
group: root
'/etc/cfn/cfn-hup.conf':
content: !Sub |
[main]
stack=${AWS::StackId}
region=${AWS::Region}
interval=1
mode: '000400'
owner: root
group: root
'/etc/cfn/hooks.d/cfn-auto-reloader.conf':
content: !Sub |
[cfn-auto-reloader-hook]
triggers=post.update
path=Resources.Instance.Metadata.AWS::CloudFormation::Init
action=/opt/aws/bin/cfn-init --verbose --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
runas=root
commands:
a_configure_sshd_command:
command: "sed -i 's:#AuthorizedKeysCommand none:AuthorizedKeysCommand /opt/authorized_keys_command.sh:g' /etc/ssh/sshd_config"
b_configure_sshd_commanduser:
command: "sed -i 's:#AuthorizedKeysCommandUser nobody:AuthorizedKeysCommandUser nobody:g' /etc/ssh/sshd_config"
c_import_users:
command: './import_users.sh'
cwd: '/opt'
services:
sysvinit:
'cfn-hup':
enabled: true
ensureRunning: true
files:
- '/etc/cfn/cfn-hup.conf'
- '/etc/cfn/hooks.d/cfn-auto-reloader.conf'
sshd:
enabled: true
ensureRunning: true
commands:
- 'a_configure_sshd_command'
- 'b_configure_sshd_commanduser'
Properties:
ImageId: !FindInMap [RegionMap, !Ref 'AWS::Region', AMI]
IamInstanceProfile: !Ref InstanceProfile
InstanceType: 't2.micro'
SecurityGroupIds:
- !Ref SecurityGroup
SubnetId: !Ref Subnet
UserData:
'Fn::Base64': !Sub |
#!/bin/bash -x
/opt/aws/bin/cfn-init --verbose --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
/opt/aws/bin/cfn-signal --exit-code=$? --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
Tags:
- Key: Name
Value: 'AWS EC2 SSH access with IAM showcase'
CreationPolicy:
ResourceSignal:
Count: 1
Timeout: PT15M
Outputs:
PublicName:
Description: 'The public name of the EC2 instance.'
Value: !GetAtt 'Instance.PublicDnsName'