Skip to content

[v12] Support AWS EC2 IMDSv2 for installer and inventory metadata #32446

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
reedloden merged 1 commit into from
Sep 25, 2023
Merged

[v12] Support AWS EC2 IMDSv2 for installer and inventory metadata #32446

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 11 additions & 11 deletions api/types/installers/installer.sh.tmpl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,14 +3,14 @@
set -eu

on_ec2() {
EC2_STATUS=$(curl -o /dev/null -w "%{http_code}" -m5 -sS "http://169.254.169.254/latest/meta-data")
# EC2 metadata sometimes requires token access, so a successful hit may
# return unauthorized/forbidden.
[ "$EC2_STATUS" = "200" ] || [ "$EC2_STATUS" = "401" ] || [ "$EC2_STATUS" = "403" ]
IMDS_TOKEN=$(curl -m5 -sS -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 300")
[ -z "$IMDS_TOKEN" ] && return 1
EC2_STATUS=$(curl -o /dev/null -w "%{http_code}" -m5 -sS -H "X-aws-ec2-metadata-token: ${IMDS_TOKEN}" "http://169.254.169.254/latest/meta-data")
[ "$EC2_STATUS" = "200" ]
}

on_azure() {
AZURE_STATUS=$(curl -o /dev/null -w "%{http_code}" -m5 -sS -H "Metadata:true" --noproxy "*" "http://169.254.169.254/metadata/versions")
AZURE_STATUS=$(curl -o /dev/null -w "%{http_code}" -m5 -sS -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=2021-02-01")
[ "$AZURE_STATUS" = "200" ]
}

Expand Down Expand Up @@ -53,10 +53,10 @@ on_azure() {
echo "Unsupported distro: $ID"
exit 1
fi
if on_azure ; then
API_VERSION=$(curl -m5 -sS -H "Metadata:true" --noproxy "*" "http://169.254.169.254/metadata/versions" | jq -r ".apiVersions[-1]")
INSTANCE_INFO=$(curl -m5 -sS -H "Metadata:true" --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=$API_VERSION&format=json")

if on_azure; then
API_VERSION=$(curl -m5 -sS -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/versions" | jq -r ".apiVersions[-1]")
INSTANCE_INFO=$(curl -m5 -sS -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=$API_VERSION&format=json")

REGION="$(echo "$INSTANCE_INFO" | jq -r .compute.location)"
RESOURCE_GROUP="$(echo "$INSTANCE_INFO" | jq -r .compute.resourceGroupName)"
Expand All @@ -65,9 +65,9 @@ on_azure() {

JOIN_METHOD=azure
LABELS="teleport.internal/vm-id=${VM_ID},teleport.internal/subscription-id=${SUBSCRIPTION_ID},teleport.internal/region=${REGION},teleport.internal/resource-group=${RESOURCE_GROUP}"
elif on_ec2 ; then
elif on_ec2; then
IMDS_TOKEN=$(curl -m5 -sS -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 300")
INSTANCE_INFO=$(curl -m5 -sS -H "X-aws-ec2-metadata-token: ${IMDS_TOKEN}" http://169.254.169.254/latest/dynamic/instance-identity/document)
INSTANCE_INFO=$(curl -m5 -sS -H "X-aws-ec2-metadata-token: ${IMDS_TOKEN}" "http://169.254.169.254/latest/dynamic/instance-identity/document")

ACCOUNT_ID="$(echo "$INSTANCE_INFO" | jq -r .accountId)"
INSTANCE_ID="$(echo "$INSTANCE_INFO" | jq -r .instanceId)"
Expand Down
29 changes: 27 additions & 2 deletions lib/inventory/metadata/metadata.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -257,12 +257,37 @@ func (c *fetchConfig) fetchCloudEnvironment() string {
// the instance is running on AWS.
// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
func (c *fetchConfig) awsHTTPGetSuccess() bool {
url := "http://169.254.169.254/latest/meta-data/"
req, err := http.NewRequestWithContext(c.context, http.MethodGet, url, nil)
url := "http://169.254.169.254/latest/api/token"
req, err := http.NewRequestWithContext(c.context, http.MethodPut, url, nil)
if err != nil {
return false
}

req.Header.Add("X-aws-ec2-metadata-token-ttl-seconds", "300")

const insecureSkipVerify = false
resp, err := c.httpDo(req, insecureSkipVerify)
if err != nil {
return false
}
defer resp.Body.Close()

imdsToken, err := io.ReadAll(resp.Body)
if err != nil {
return false
}

if resp.StatusCode != http.StatusOK || imdsToken == nil {
return false
}

url = "http://169.254.169.254/latest/meta-data/"
req, err = http.NewRequestWithContext(c.context, http.MethodGet, url, nil)
if err != nil {
return false
}

req.Header.Add("X-aws-ec2-metadata-token", string(imdsToken))
return c.httpReqSuccess(req)
}

Expand Down
39 changes: 33 additions & 6 deletions lib/inventory/metadata/metadata_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -283,18 +283,45 @@ func TestFetchCloudEnvironment(t *testing.T) {
if insecureSkipVerify {
return nil, trace.BadParameter("insecureSkipVerify should be false")
}
if req.URL.String() != "http://169.254.169.254/latest/meta-data/" {
return nil, trace.NotFound("not found")

if req.URL.String() == "http://169.254.169.254/latest/api/token" {
if req.Method != http.MethodPut {
return nil, trace.NotFound("not found")
}
if len(req.Header) != 1 {
return nil, trace.NotFound("not found")
}
if len(req.Header["X-Aws-Ec2-Metadata-Token-Ttl-Seconds"]) != 1 {
return nil, trace.NotFound("not found")
}
if req.Header["X-Aws-Ec2-Metadata-Token-Ttl-Seconds"][0] != "300" {
return nil, trace.NotFound("not found")
}
return &http.Response{
StatusCode: 200,
Body: io.NopCloser(strings.NewReader("thisIsAFakeTestToken")),
}, nil
}
if len(req.Header) != 0 {
return nil, trace.NotFound("not found")

if req.URL.String() == "http://169.254.169.254/latest/meta-data/" {
if len(req.Header) != 1 {
return nil, trace.NotFound("not found")
}
if len(req.Header["X-Aws-Ec2-Metadata-Token"]) != 1 {
return nil, trace.NotFound("not found")
}
if req.Header["X-Aws-Ec2-Metadata-Token"][0] != "thisIsAFakeTestToken" {
return nil, trace.NotFound("not found")
}
return success, nil
}
return success, nil

return nil, trace.NotFound("not found")
},
expected: "aws",
},
{
desc: "gcp if on gcp ",
desc: "gcp if on gcp",
httpDo: func(req *http.Request, insecureSkipVerify bool) (*http.Response, error) {
if insecureSkipVerify {
return nil, trace.BadParameter("insecureSkipVerify should be false")
Expand Down