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
|
#
# Author:: Tim Dysinger (<tim@dysinger.net>)
# Author:: Benjamin Black (<bb@chef.io>)
# Author:: Christopher Brown (<cb@chef.io>)
# Author:: Tim Smith (<tsmith@chef.io>)
# Copyright:: Copyright (c) 2009-2016 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# How we detect EC2 from easiest to hardest & least reliable
# 1. Ohai ec2 hint exists. This always works
# 2. Xen hypervisor UUID starts with 'ec2'. This catches Linux HVM & paravirt instances
# 3. DMI data mentions amazon. This catches HVM instances in a VPC
# 4. Kernel data mentioned Amazon. This catches Windows HVM & paravirt instances
require "ohai/mixin/ec2_metadata"
require "ohai/mixin/http_helper"
require "base64"
Ohai.plugin(:EC2) do
include Ohai::Mixin::Ec2Metadata
include Ohai::Mixin::HttpHelper
provides "ec2"
depends "dmi"
depends "kernel"
# look for amazon string in dmi bios data
# this gets us detection of HVM instances that are within a VPC
def has_ec2_dmi?
# detect a version of '4.2.amazon'
if get_attribute(:dmi, :bios, :all_records, 0, :Version) =~ /amazon/
Ohai::Log.debug("Plugin EC2: has_ec2_dmi? == true")
true
else
Ohai::Log.debug("Plugin EC2: has_ec2_dmi? == false")
false
end
end
# looks for a xen UUID that starts with ec2
# this gets us detection of Linux HVM and Paravirt hosts
def has_ec2_xen_uuid?
if ::File.exist?("/sys/hypervisor/uuid")
if ::File.read("/sys/hypervisor/uuid") =~ /^ec2/
Ohai::Log.debug("Plugin EC2: has_ec2_xen_uuid? == true")
return true
end
end
Ohai::Log.debug("Plugin EC2: has_ec2_xen_uuid? == false")
false
end
# looks for the Amazon.com Organization in Windows Kernel data
# this gets us detection of Windows systems
def has_amazon_org?
# detect an Organization of 'Amazon.com'
if get_attribute(:kernel, :os_info, :organization) =~ /Amazon/
Ohai::Log.debug("Plugin EC2: has_amazon_org? == true")
true
else
Ohai::Log.debug("Plugin EC2: has_amazon_org? == false")
false
end
end
def looks_like_ec2?
return true if hint?("ec2")
# Even if it looks like EC2 try to connect first
if has_ec2_xen_uuid? || has_ec2_dmi? || has_amazon_org?
return true if can_socket_connect?(Ohai::Mixin::Ec2Metadata::EC2_METADATA_ADDR, 80)
end
end
collect_data do
if looks_like_ec2?
Ohai::Log.debug("Plugin EC2: looks_like_ec2? == true")
ec2 Mash.new
fetch_metadata.each do |k, v|
# fetch_metadata returns IAM security credentials, including the IAM user's
# secret access key. We'd rather not have ohai send this information
# to the server.
# http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AESDG-chapter-instancedata.html#instancedata-data-categories
next if k == "iam" && !hint?("iam")
ec2[k] = v
end
ec2[:userdata] = fetch_userdata
ec2[:account_id] = fetch_dynamic_data["accountId"]
ec2[:availability_zone] = fetch_dynamic_data["availabilityZone"]
ec2[:region] = fetch_dynamic_data["region"]
# ASCII-8BIT is equivalent to BINARY in this case
if ec2[:userdata] && ec2[:userdata].encoding.to_s == "ASCII-8BIT"
Ohai::Log.debug("Plugin EC2: Binary UserData Found. Storing in base64")
ec2[:userdata] = Base64.encode64(ec2[:userdata])
end
else
Ohai::Log.debug("Plugin EC2: looks_like_ec2? == false")
false
end
end
end
|
